Coach Dave Wannstedt said after practice that Thompson deserved the opportunity to work with the first team and that he had been as impressive as any free agent the Dolphins signed this offseason.
As for McKnight, he can't be happy about the latest development, but he's already shown that he's not going to make waves publicly.
What Thompson working with the first unit means is that the wide receiver rotation is far from settled and could change a few more times before the Sept. 7 opener against Houston.
The way Wannstedt sees it, things will happen at some point during the preseason and even the regular season and things will take care of themselves.
Of course, with the Dolphins having four wide receivers on the roster who have been starters could be tricky because egos could get bruised, but Wannstedt seemed unconcerned.
It was, however, telling that Thompson supplanted McKnight on the first day of camp when Wannstedt said in the offseason that McKnight would be his starter if the season started at that time.