I had this perception in the 2nd quarter of last night's game as I saw a couple possesions where Yi ended up guarding Bibby on the perimeter, and using his length to cause him to miss. My knock on Yi was that he was always too slow to guard the perimeter against 1,2, or 3's, but if we're playing great team defense maybe a Harris, Vince, Yi, Sean, Brook lineup isn't out of the question? It's just a thought, what with Simmons looking replaceable, and Jarvis Hayes being essential off the bench.
It's definitely possible. But why mess with success? This line-up has given us 2 good wins already, let's leave it alone until it doesn't work anymore IMO.