Heenan not returning to the WWF?

When WCW released Bobby Heenan in Nov. 2000, do you think the reason Vince McMahon didn't bring him back to announce for the WWF was because he still held a grudge at that time for Heenan going over to WCW, or was it simply a case of being being satisfied with his current announce team?  

Heenan's own theory was that Vince made sure to bring back all the people from WCW who slagged him on air, just to prove that he could.  Bobby always made sure to stay loyal to Vince and never said anything bad about him, so in Vince's mind, he had no incentive to bring Bobby back and thus never did.