What do you guys think? Should your techniques work even when someone gets super rigid and muscled up?
aikido should work 'especially' when someone gets super rigid and muscled up. When they do that, they lose co-ordination. The hard part is not fighting their resistance. Nage's practice is to remain calm, centred and relaxed and through sensitivity find the place of no resistance (it's always there, just sometimes the opening is small). Your teacher is the one to show you the way through this.
just a thought,