Eh, that's probably stretching it.
Armstrong - 474/878, 54.0%, 6691 yard, 7.6 ypa, 53 TDs, 36 INTs
Crouch - 312/606, 51.5%, 4481 yards, 7.39 ypa, 29 TDs, 25 INTs
Frost - 192/359, 53.5%, 2677 yards, 7.5 ypa, 18 TDs, 7 INTs
Lord - 194/404, 48.0%, 4848 yards, 7.05 ypa, 18 TDs 22 INTs
I'd agree with you on Lord - TA is significantly better. TA is also a better passer than Crouch but also running a system that is more passing friendly so I'm not sure it's a huge difference.
But TA is almost identical to Frost. Their completion percentage and yards per attempt are very similar. If you adjust Frost's stats to TA's attempt numbers, Frost would have 6531 yards, 44 TDs and 17 INTs - basically the same yards, fewer TDs but a much better TD:INT ratio.