I did not hear Loomis's mention of the other head coaches. But to compare Allen to Noll, Landry, and Belichick is absolutely insulting.
The reason Loomis gave for hiring Allen was continuity--that with Allen the team would continue playing at a fairly high level. Dennis Allen wasn't hired to rebuild a team.
Tom Landry began coaching an expansion team.
Chuck Noll took over historically the worst franchise in the NFL that had just experienced five straight losing seasons and that went 2-11-1 the year before.
Bill Belichick struggled in Cleveland and was rightfully discharged there.