Its not that they don't need another Big man. the problem is they got KP and it seems like the knicks plan to give him minutes to develop. If KP is the future why invest heavy into a PF this year in FA? If they get a rental worth a damn or in need of a long term contract like D. Lee that guy is going to want to play heavy minutes the whole season.. I doubt the knicks wanted Aldridge to only play Center on the knicks but with KP on the roster he would of saw minutes there eventually.
So at this point the knicks need to find a older PF (maybe somebody willing to take that cap room exception?) or just keep players like Amundson or Jason smith so KP has a buffer but not a guy trying to eat his minutes at PF. If KP develops rapidly then the PF situation takes care of itself.
I think you gotta let KP work with that second squad... be the first dude off the bench type of role.
And to me Jason Smith and Admundson are not starters. So yea my priority would be to bring in a strong PF who can start and also help KP develop.