No. Delph is no better than Mason, and isn't even a Spurs lad.
Seriously, VillaTalk forum members seem to regard him as a limited player with the potential to eventually become good enough for one of the top four, if he plays his cards right. Some of them aren't even that fussed by him leaving, hardly the sign of an irreplaceable footballer.
Mason has been here for sixteen years, is a surprisingly astute passer and his defensive game has improved as the season has worn on. He's a hard worker, good presser and passionate on the field. He is much, much more suited for us than Fabian Delph.