Since when does Leach make his system fit his talent? He's used the same Air Raid system for two decades now, going back to his time as an OC under Hal Mumme. Now that system absolutely works and puts up tons of yards, but let's not pretend like he adapts his system -- indeed, his system is set up to gain yards through the air no matter who plays, as long as its being run by players who aren't terrible.
He's a good coach, but his records at WSU are:
3-9 (2012)
6-7 (2013)
3-9 (2014)
9-4 (2015)
7-2 (2016)
WSU was a dumpster fire when he got there, but it still took him four years to have a winning record. It took time to bring in the players that fit what he wants to do on offense -- that's time that almost any coach in a new job needs. If you want to compare him to Richt, let's see what we look like in a couple years when Richt has his players running his desired system.