Meh, not much. A few tunes at each show where Dave is off-key. Nothing huge. Not as off-key as Eddie was on some nights of the 07/08 tour. But when has Dave ever been a great singer? We don't go for his voice but his attitude.
As far as Daves back, doubtful. the way he is still kicking & moving I doubt it would cause them to postpone shows. We would have seen Dave agonize or slow down before they did that.
Infighting? Very very doubtful. They made it through the 2004 tour and that was horrific. Judging by their stage presence & interaction they have a long ways to go before they postpone dates.
My gut?

As far as cancer.......depending on what needs to be done, waiting 5-6 weeks is not a huge stretch. Some localized radiation or small doses of chemo to keep it in a hold pattern until 6 weeks when a surgery can be performed. Might be what we are dealing with here.
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