I dont think anyone way suggesting that Mayer play over Mayer. If anything, they are complementary players. Tremble, for as good of a blocker as he is, still has more speed and athleticism to be a stretch the field tight end than Mayer who figures to do most of his damage within 10 yards of the line of scrimmage right now. Having both play at high levels would be very, very good for this offense - especially since Rees seems to understand how to utilize multiple tight ends better than Chip Long did.