The heart issue is interesting, and not really much said to this point about either of their conditions.
So we are left to assume that both players are healthy enough to play NBA basketball for 30 or more minutes a game. Of course Wicox is unlikely to play that many minutes, but the point is they are cleared to play a game that requires the highest level of heart health possible (my layperson's guess).
Despite my cynnicism about doctors' capacity to know for sure, I am sure that the C's (and Green/Wilcox) would not be taking any chances if there were any known above normal risk. That said, I would suspect that any 'normal' person would have to get past the psychological challenges of having had open heart surgery and then competing physically day after day at the highest level.
I am not suggesting that either or both will be unable to cope, but it would be pretty surprising if neither of them have some period of mental adjustment -- even as they experiece typical wear and tear symptoms that now will have them thinking a little differently.