Ugh. If he can't even practice, he isn't nearly ready for gameplay. Depending on how the first few games go, I'd try to shut him down as long as possible.
Having him makes life A LOT easier, especially against Miami and Chicago. I truly believe we can still beat them without him, but it will be tougher. Fortunately, the Knicks don't have very good centers. Neither does Miami, but one is physical (Anthony) and the other has length and range (Ilgauskas). Noah doesn't scare me, I feel we can get into his head, especially KG.
But if we were to meet LA again, I feel we would be giving up wayyyy to many second chance opportunities like last Finals. What good is holding your opponent to 40% FG when you are giving them 15 extra shots than you? Shaq would undoubtedly be able to prevent them from getting wherever they want in the paint.
JO is going to have to step up, especially these first few games of the playoffs. I believe he is prepared mentally and physically. He was brought in for this ('Sheed v2.0?), and everyone knows this.