Who Stone is doesn't really matter. What he did matters.
IIRC, this is more or less the TPTB stance, or at least was before the change of line dev. I doubt this has changed though.
The only cases where his past may matter is that if he was a Clanner (extremely unlikely) given the attitude of some people towards Clanners, or if he was Arthur Steiner-Davion, since people might have issues with another Steiner-Davion running a super-nation. But the latter theory, even if originally intended, is likely not true. (Since it is indicated ASD is alive plus considering certain canon-rumor about him, i reckon ASD might be part of any WoB remnants fled from the Inner Sphere at the end of the Jihad, if there are any.)
So, he is just a nobody that made something big. It happens sometimes. And it is a change to the usual in BT, where most people who do big things have important lineage as well.