Doug Collins, An Addition For The Vision

The Bulls Tuesday signed a former four-time All-Star with a great shooting touch and unparalleled basketball knowledge.

Yes, he’s 66 years old. But the foundation, which is out of sight, does support the strength that makes up any final edifice. The Bulls hope to construct a towering new model of excellence. They believe they have added a rock who will support the structure.

“As I got older, I wanted to end my career like this,” said onetime Bulls coach Doug Collins, who is returning to the organization as a senior advisor. “Being in a position where I can be a mentor, an older guy who has seen it all, the highs and the lows. What I’ve always said about the game is that it’s given me the…