Pat, I don't think reward-only works unless the relationship is sound - but to be very frank, 'punishment' can be a look, a body language, it isn't like 'punishment' means beating the dog with a stick every time it twitches its ear. Even 'punishment' can be very subtle and very non physical. Call it a 'correction', a 're-establishment of the leader role', 'body language', call it 'bluff and a lot of drama', call it 'projecting a certain energy', call it withdrawing of attention, call it very subtle positioning of the body...
And I think there is a LOT more going on between a dog and a trainer than what is obvious - you've had one dog for a few months and there is an awful lot more to see yet - not everything that goes on is obviously one thing or another, anyway. The most effective methods involve more than one effect and have a great deal of economy.
And no, the repair to the relationship is very, very different from 'stopping dog from clawing, smashing right now', etc.
But this dog needs to be 'punished' for jumping, clawing, smashing into people, and things like that. The behavior needs to stop, immediately, today, right now - the longer it goes on, the harder it is to eradicate.
What is 'punishment'? Whatever works in that situation, and not one iota more.