On Varejao coming here - It looks good "on paper" and compared to how the Suns centers played last season (Len), he would help - But that was last season ... Going after Varejao would be similar to keeping Gortat last year because of how Plumlee played the previous year - It is a move that will probably be pointless, besides being "safe" by having the "proven" center
The Suns moved Gortat last year because Plumlee impressed during the summer ... I think the Suns have great faith in Len to break-out like Plumlee did last year. They see him working every day during the offseason - If he's making progress, going after a proven center wouldn't help - if he's not improving and still doesn't look ready in scrimmages, then maybe they'll go after another rotation big guy.
Whatever move they make in the coming weeks to go after a "proven" center or stick w/ Len as the backup will be the right move probably because they know more about Len's improvement than everybody else. From everything I've read and given Len's apparent improvement in his 1 summer league, I think the Suns like what they see and want to stick w/ him though.