Most of the time players have loyalty to teams who put faith and picked them, even if they are college players. It's especially more meaningful if they're later picks and were passed on by teams. You could grow up cheering for said teams that passes on you a few times than have another team use a pick, be very happy that they have gotten you and see you as an integral part of their future.
Gaud, Hughes and Boes never bolted. Hell Gaud even admitted to cheering for Boston in 2011.