Doug, I know that this is conjecture, as we are all guessing here. If I was a betting man, however, I would probably bet that there is some truth to all this.
If he lost a close, (father type figure), AND he was angry at finding himself in an untennable contract situation, AND he had a habit of eating more than he should anyway, ----- then he might indeed be in trouble here. You asked who he surrounded himself with, and the answer is FAMILY. Samoans are known to have very close families, AND they tend to be rather large people who love to eat. I could see that if he was sad at losing his friend, and was angry with his contract situation, and took solace in his family, (isolated from team influences), then he could have ballooned to the purported weight over the off season.
If his family is like mine, (old school who don't believe in psychiatry), then he would be expected to strap on his boot strings and pull himself out of his trouble. In fact, he may have had more grief than he could deal with. This scenario is very sad, but unfortunalely it is very possibly also true. Worse yet, ----- if it is true, then it will take much longer to undo the damage than it took to create it.