The only thing I'm worried about is the NFL doing something about this. They don't need to prove anything. As we know all they need to do is say they BELIEVE something is more probable than not. Given there is video they can do that whenever they chose. I doubt they will considering the kind of things they've looked the other way on WRs for. But Diggs wouldn't get as much slack as a guy like Hill would, even for a much lesser issue.
But even if they NFL doesn't do anything this still hurts the Patriots. You only get to set a new tone once and if people don't buy in that's it.
I don't expect every second of Stefon's day to be dedicated to football and rehab. That simply isn't practical. But to hand around whatever that is on a boat while other gets put in work at OTAs sends a bad message to every guy on the locker room.
As for what is best to do about it. Vrabel should ask Diggs to quietly make the rounds to teammates about how he messed up but now his head is back in it. As for Diggs making a public statement, best to leave that to lawyers when drugs are involved and it could become a legal matter. Will he do those things? Idk. But it seems clear it is likely some kind of brand product. So weed/THC and not a different class of drug. Which is a simpler matter, but still could cause action by the NFL.