It wasn't clear, or maybe I missed it, but does Pyrrhus still rule in Epeiros as well (you say he withdrew the garrisons but the AAR doesn't mention whether the cities there then rebelled or were taken by any of the other factions after his withdrawal?)
I always wondered about the possibility of taking Pyrrhus - the leading military strategist of the time - to conquer Alexandria and Ptolemaic Egypt - the strongest (I think!) economic area of the time? If he could pull that off, and establish his economic base as well as having his military power in hand, Epeiros would clearly be a force to reckon with for a long time to come (and would certainly be a legacy to leave his sons to work with going forward)!
Maybe you have somewhat similar thoughts - starting with expansion in Syrakousai and Krete? Leaving each son a separate base of operations to expand from?