If by an 'impossible condition' (for anchoring) you mean, for example, anchoring a display to ID #4468564, then that'd be even less costly than the other method in terms of CPU, but the behaviour is somewhat undefined, so you're relying on an implementation detail there.
In addition, you wouldn't be able to export the aura I think. Depends how I handle it.
It's a micro-optimisation point anyway, you'd probably need to play the game for several hundred hours before it'd have added about 1ms of execution time overall.
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