Well we know that one of them is true, so maybe you'd say it's more like 3%/97%. And of course we shouldn't base our lynch on assuming that we have a more likely setup, it's just something to take into account.
I think what we mostly need to take into account is whether or not gkrieg/ash and unknown partner would take the risk knowing such percentages. That is really the question that needs to be asked more than anything else.
But it also needs to be kept in mind that in mafia's eyes at the time they were considering claiming there was only a 50% chance that this would be the fake scenario that would need to be created DBMMMT. The other 50% chance was DMMMTT, which occurs a little bit more often...
Because if fakeclaiming (with what we know of the setup, DBTTTT) mafia knew 1-shot Strongman, Roleblocker so knew there would either be TTTT or TTT so 4Ts to fake claim with or 3Ts to fake claim with.
Wait, I am getting this wrong then. The other 50% chance would be DBXMMM (not what I have above) which would be super, super risky as it is even more rare than what Jimmmmm was describing above.
So gkrieg/ash and buddy would have had to know they would be putting us in a super unlikely scenario or a super, super, super unlikely scenario statistically. Which I don't think they would do.
Either that or they didn't fully weight the statistical risk when making their decision...