I thought Davey was lucky more than anything. I can see why he can't get into the Somerset 1st eleven.
I think good pace is becoming a big feature of successful teams these days, so I can see why England wouldn't want to go for too many sub 85mph bowlers. Saying that, Broad and Anderson weren't bowling quick during the WC, and every 85mph+ bowler coached by Saker has ended up losing pace, with exception of Woakes, who has got quicker. However, that's probably more to do with the year he had away from the national team after the 2013 oval test.