Forget the goody-two-shoe stuff about policy being paramount. Personality - as in who gets the State car - is a big factor here.
This coming week will tell us much about whether Micheál and Leo can get a third, or maybe even fourth, leg for their "government stool". The pressure will be heaped, some of it quite unfairly, upon the Green Party, Labour and the Social Democrats.
There will be plenty of aul guff about the "national interest", and lots of high-minded talk about policy, and what to do after the coronavirus hopefully departs and we ponder the social and economic wreckage of a much-changed world.
A fiver for the first one to say: "This is not a time to talk about jobs for the boys - and even some girls. This has to be all about policy."
Since the dawn of time, very many people have come to politics via political personalities. Historians will often tell you the personal is too often undervalued, if not entirely overlooked, when it comes to assessing momentous past events.
Stitching together and selling a coalition deal requires big emollient personalities on all sides. People who are good with people are urgently required.
If - and it still remains a big if - Fianna Fáil and Fine Gael do get to stitch together a coalition with another party or parties, then we know Micheál Martin gets first shot at being Taoiseach. Leo Varadkar will then become the first ever Taoiseach to subsequently serve as Tánaiste, before eventually slipping back into the Taoiseach's office.
But who gets the other jobs? The answer will be key to selling this deal, as all participants must in some shape or form, to their party membership.
Many household names in the "big two" are already bracing themselves for disappointment and the loss or non-delivery of government office. Fianna Fáil has huge pent-up demand as they have not had a cut at this for a decade.
But both Fianna Fáil and Fine Gael will only have five other cabinet jobs to give their stalwarts. That already makes the task of selling a would-be coalition deal all the harder.
But this time, more than others, the heft of responsibility given to each cabinet appointment will also be hugely important.
The key job will, as always, be finance. No moneybags to deploy funds gives you precisely nothing.
Michael McGrath of Fianna Fáil and current incumbent Paschal Donohoe of Fine Gael already have their names on that one.
It can be argued that it is time to revert to a split in this mammoth department with one or other of them getting spending and the other Revenue. Who gets what will be a huge row within a row.
Curiously, another big portfolio will be enterprise and jobs, where Heather Humphreys of Fine Gael is currently operating well. If we are looking at ways to revive a smashed economy this job will be crucial.
Simon Coveney's name could be on that one but so too could be that of his counterpart deputy leader in Fianna Fáil, Dara Calleary.
Gender and geography will have to figure in the other picks. Humphreys could well be joined in cabinet by Helen McEntee who has read herself well into the important job of junior EU affairs minister in a time of Brexit. However, watch the fallout here from McEntee's constituency rival and current caretaker, Social Protection Minister, Regina Doherty.
She is currently without a Dáil seat and surely has hopes of a Seanad nomination.
Only twice before in the State's history have nominated senators been appointed to cabinet. This time jobs are too scarce to imagine Doherty emulating the feat of Fianna Fáil's Seán Moylan in 1957 or Fine Gael's James Dooge in 1981.
Mention of Dara Calleary raises the prospect of a formidable backlash from his Fine Gael constituency rival, Michael Ring, if he is overlooked. A similar situation is in the offing if Fianna Fáil's Jim O'Callaghan gets the nod while his Dublin Bay South Fine Gael rival, Eoghan Murphy, may well get the chop.
Then we come to the question of who gets the pivotal cabinet slots of health and housing. Fianna Fáil is more likely to fight for housing, which looks like the one where it's easier to show results.
That means Simon Harris of Fine Gael, given a new lease of political life by coronavirus, just might hang in with health.
Who in Fianna Fáil gets housing is a matter of great conjecture. Limerick's political fox Willie O'Dea, a qualified accountant and lawyer, would be a great choice. But the chemistry between O'Dea and Martin appears decidedly lacking.
Who of the others in Fianna Fáil look likely to make the cut? Well, Anne Rabbitte in East Galway looks likely on grounds of gender. Thomas Byrne of Meath East would also be an excellent choice as a seasoned and pragmatic politician with youth on his side.
We'll come back in the coming days to the big decisions and pressures facing the Green Party, Labour and the Social Democrats. It is clear the Greens, who got two full ministries in 2007 with six TDs, would command at least three this time around.
Labour and/or the Social Democrats would probably rate one minister and at least one of the two "super-juniors" who also attend cabinet.
Ignore those who tell you that much of the foregoing is an after-thought - it is no such thing. In fact it is central to the whole process of coalition-making.
The haggling at the top leadership levels may well put the policy squabbles in the halfpenny place.