Collins was deservedly Player Of The Season last year. I agree with all your points. Collins is very confident, and confidence is important. I suspect Isted's recent errors may have dented his confidence a little. I would reinstate Collins.
I'd expect a bit of rotation of the squad for Monday's game. Possibly one or two changes up front & maybe Collins in too? Duff seemed happy with the performance, but we looked to have more energy when the subs were introduced, so I'd expect some freshening up of the starting line up.
I think you'll find it has happened' off the top of my head i remember him getting lobbed by both Stoke and Wycombe ' thats besides the countless boo boos he got away with' good shot stopper though' all about opinions though mate.
So only twice he's been caught out? I'd say that is some going. Ederson & Alisson have had more goal-leading errors this season than Collins.