I see your point, but I think the Pollard touchdown was somewhat of a fluke. He may prove me wrong, but I think Mike Williams will prove to be the big guy in the red zone to throw it to, as he has nice size and much better hands.
I still maintain that it's hard to get incredibly excited about any of the Detroit receiving threats. A) Because they appear to be a run-oriented offense, and probably rightfully so, B) Because Harrington still scares me, and I don't think Jeff Garcia would be any more reassuring, and most importantly C) There are simply too many threats on that team for any one to be a major fantasy producer, especially the tight end.
The Lions are no Colts. It took a record-breaking performance by the best QB in the league for three WR's to see good numbers in Indy, and at the expense of Harrison (no top 5 finish), Edge (red zone touches stolen), and Pollard/Clark. Marcus Pollard could be a decent fantasy sleeper if he's targeted frequently in the red zone but due to the reasons I outlined, I don't think he'll have enough consistent yardage to outproduce a guy like Baker, who should be one of Pennington's primary guys.