With all due respect, I think you might be fantasizing those deep balls a bit. Of the three touchdowns Devin Smith had against Wisconsin, on two of them he won what many would call jump balls. The other touchdown was undoubtedly as gorgeous a deep ball I've ever seen, but the other two weren't all Cardale.
As for Braxton having NFL WRs for 3 years, I'm sorry but that's just plain wrong. As great as Devin Smith was for us, he was recently cut by the Jets I believe (albeit due to injuries more than anything). Philly Brown, Braxton's most reliable receiver during his time at the helm, had three decent years with Carolina where he broke the 30 reception mark once. Jeff Heuerman and Jake Stoneburner then were his third best targets during their respective years with Braxton. Braxton never got to play meaningful time with Jalin Marshall, Micheal Thomas, hell even his one year with Dontre Wilson was one where Urban would later call Dontre a "hood ornament" rather than an actual threat on offense.
If you love Braxton, then you would know how great he was and how much he could of flourished with the weapons on that 2014 team. He did not struggle in every facet of the passing game, and if it were not for his shoulder injuries it would be foolish to say he would be seeing less success than Cardale is right now as an NFL QB. Again, all due respect as a fellow fan, but I think you're way off the mark on this one.