I think that Sanchez and Bradford are both fighting for the number one spot. Barkley is number 2 and Tebow is number 3. Whoever loses the number one spot is not going to remain with the team; salary cap reasons alone would prevent that. Bradford is about a $13 million hit to the cap and Sanchez is about $5.5 million. No team is going to pay that much for a second stringer. So regardless of who is the first string, Tebow has a good shot at remaining on the roster as the third string, unless he does so badly that the Eagles cut him and bring in someone to replace him. His performance on Sunday doesn't warrant that yet.
Bradford is about a $13 million hit to the cap and Sanchez is about $5.5 million. No team is going to pay that much for a second stringer.
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You may well be correct on that point, but according to this site, Sanchez’s cap hit is 3.75 mil, not your 5.5.
http://overthecap.com/position/quarterback/2015/
Bradfords 13 and Sanchez at 3.75 together at 16.75 is about the same number 10 NFL teams have tied up (in cap space) for just their starter, so it may not be out of the question to keep them both.