Agreed, and to the bolded part of your point, Jackson has the physical tools that Allen has; just not the polish, practice, and understanding. He's a big-armed athlete who is willing to work hard, is malleable, and has a good, team-first attitude.
I think back to the whole Peterman debacle, and we can all poke holes in that charade, but one point that people don't really discuss is that the OC (Rico) essentially had to develop two different game styles for Peterman and Allen. That makes for a steeper learning curve and leaves less time for the offense to learn each style.
With a PS candidate like Jackson, at least the script will read the same, if Tyree gets tossed in there. I also think Daboll is Mozart to Rico's penny whistle cover of "You Are My Sunshine", but that's another story, altogether ?.