Considered by who? You? Do you think that the Ravens released a Top 10 TE in the NFL without even offering to renegotiate his contract because they're stupid? Todd Heap isn't even the best former Sun Devil tight end playing in the NFL.
1. Vernon Davis
2. Antonio Gates
3. Jermichael Finley
4. Jason Witten
5. Marcedes Lewis
6. Dustin Keller
7. Zach Miller
8. Tony Gonazales
9. Heath Miller
10. Owen Daniels
11. Dallas Clark
12. Jacob Tamme (that's right--Heap probably wouldn't start for the Colts even in 2 TE sets)
13. Brent Celek
14. Greg Olsen
15. Jeremy Shockey (no, he wouldn't start for the Panthers, either)
And that's before going into guys who aren't proven but have way more upside than Heap like Hernandez, Gronkowski, Moeaki, Pettigrew,, Graham and Gresham.
The Baltimore Ravens decided that they were going to totally remake their passing offense, and they didn't want Todd Heap along for the ride. Shouldn't that tell you something about his value around the league?