Walker is clearly the most egregious offender and was correctly tossed. However I do think the trainer was engaging in a bit of gamesmanship. Wouldn't be at all surprised if that was a strategic love tap knowing that it would get under Walker's skin. I'm sure all opponents are well aware of his short fuse and there is definitely precedent for trainers to be "part of the game plan." There is definitely a distinction between team doctors and team trainers.
Wyatt, meh. They were both getting aggressive with each other at that point and he brushed up against the trainer. I think stretching it as far to say they're bad draft picks is, yeah, a stretch.