Rocky and Shawn ???

How come the two never worked a program after Shawn came back in 02 ?? Shawn seemed to work with literally everyone and anyone there for a while and Rock was coming back in to the fold intermittently between 03 and 04 and later also. The whole thing seems like a huge missed opportunity. Any backstory there ? Heat or just a horrible missed opportunity to do a classic match ?

Heat!  Rocky apparently felt like coked out Shawn treated him like crap coming up and he never forgave him until he was out of the promotion.