I can't see scuffing on the stator, on this side, at least.  If there isn't any on the other side, then maybe it's more likely a one-time event than a long-time misalignment or deformation.  About all I can say.

I think it would have to be spinning to do this. Is there any rectifier damage?

I also am interested in what you find.

You basically said it was burnt out before, many of these things run more or less burnt out for a long time, most are pushed well beyond normal working temperatures and the life is likely to be short. If you didn't have all phases shorted together then that would have made the chances of it getting away from stall much higher.

There are always dangers associated with short circuit braking. In many cases things survive better if left running if they furl properly. For something that is left unattended some back up way of stopping it makes a lot of sense. If not the alternator must be very large in relation to the blades. In this case it will perform badly without some resistance in the line. This resistance must not be included in the braking circuit. I have often suggested using smaller line cable to improve performance. this is fine with things running and furling but the extra resistance goes against you if you try to hold it braked.

When the 3-Phase was shorted, was it at tower base or end-of-line, and what are the tower drop line and transmission line sizes, & where were the wires bridged, before or after the rectifiers? Flux already noted where resistance works against safekeeping via shorting.