No way that Tessio was setting up Vito at the Hospital. Let's remember something, if Tessio was turning on the Corleone's that early on, and was already going over to Barzini, then he would have tipped Barzini off about the hit on Sollozo and McClusky. Remember this, Tessio was the one who had the gun planted behind the toilet, and also, if memory serves me correctly, according to the book, Tessio was the getaway driver for Mike after the hit. Nah, there is no way that Tessio was involved in the removal of the guards at the hospital. Once the Don relinquished power over to Mike, and Tessio complained about what was going on and Vito would not act, asking him to trust Mike, it was then, upon leaving that meeting that Tessio most likely put his plan into action, and reached out to Barzini.


Don Cardi