Looking back I think it's obvious that Holmes must've felt strongly that there was a big drop off in WR from London, Wilson and Williams to the next batch which is why he made the move when he did.
Yeah the ESPN pundits and others kept talking about how deep of class it was as evidence of the number of 1st rounders and that is true but that doesn't mean they are all on the same tier.
For instance Scouts Inc. has Williams at a 92 while they have Dotson at 87, Watson at 84 and Pickens at 83, while that doesn't seem like much in reality the difference between mid 80s and low 90s is pretty massive on a scouting scale, so while the latter may be still be 1st or early 2nds they arent in the same class as somebody like Williams.