Here in IL, I would strongly say a main frame 8pt at 2.5yo, will remain that the rest of his life...
of course other things could affect this, if he's an 8pt in a drought year/poor food etc... he could potentially become a 10pt etc...
it'll be interesting to see...
but either way 8pt vs. 10pt, I'd rather have a stud 8pt breeding vs. a weak 8pt...