With Marquis coming -- Tony, Bill & JR are just to similar--they are playing for one maybe 2 spots. Absent a trade Giddens will have training camp to prove himself or be waived. TA has a contract and Walker simply is bigger and stronger than Giddens, Giddens is a 2 and Walker a 2/3. Doc saying they are even was most likely just motivation and/or a sales pitch for trading Giddens, or throwing him in in a trade.
Other than most of what I've read this summer is making Giddens the favorite over Walker, including DA's seeming reluctance to include Giddens over Walker in a trade.
I'll tell you this, DA is not just going to waive Walker or JR. TA has a contract? So does JR and Walker.
And JR is certainly a 2/3 type of player. Walker is more of 3/2, but the difference is not much, as JR is quite strong himself, a better defender, a better rebounder, and has a long wingspan.