Consider this my friends,

Michael was a brilliant man, especially in his ability to anticipate events. Remember the advice the Don gave him in GFI while they were talking in the back yard about checking the phone calls that go in and out of the house because, "it could be anybody...you never know" One would believe that Michael utilized all the knowledge his dad passed on to him throughout his life. With that in mind:

What if it was Michael that actually "staged" a hit on himself to throw everyone off. After all, he knew someone close to the family was a traitor. All of their people were "businessmen" as he told Tom, and with that, "anything's possible" So Michael stages a hit on himself which could, 1, make the traitor extremely nervous about their relationship with Michael's enemy since the hit wasn't discussed, and/or 2, maybe encourage his enemies to start aligning together to discuss who actually wanted him dead and who attempted it. These types of meetings would surely get back to Michael, such as all seemingly pertinent information did. If girl with no family would be sacrificed for the advancement of Michael's gain (Senator Geary's hooker), surely two unkown buttons out of New York would suffice in the ultimate plan of flushing out and eliminating a traitor.