This is the book on Bishop according to B.R. He is the 20th ranked ILB in the league. (15 spots above Foster)7
Bishop is a good athlete with solid quickness and flexibility.
He is average in coverage.
Bishop does a nice job attacking through the A-gap and making plays on the backfield, and does a good job getting the defense set up, but he can be slow to react to play-action and misdirection.
Strong enough to make tackles but can struggle to close gaps in run defense.
Doesn't show great strength to take on and release from blockers at the second level in run defense.
Shows the speed to extend and make plays outside the tackle box.
Has good strength to take on backs in the hole and win battles.
He is a very good tackler, and won't let many runners get through his grasp.
He sat out three games in 2011, and all of 2012.
He is an overall very athletic inside linebacker with good range, Bishop has the skills to extend and reach the ball on outside plays. Where the five-year vet struggles is taking on blocks and breaking free to lock down the inside run.
Moving Foster over to SLB and signing Bishop at ILB would give the Bucs an upgrade, but not enough of an upgrade to justify the costs imho.