Limit for all mobs was 4.
Two options....
1. It got changed somewhere around then to no limit/raised limit
2. The poster didn't notice the actual pet behavior. When you engaged more than 4 pets on a mob only 4 pets could be actively swinging. It wasn't always the same 4 on any given round. If you had 6, some (seemingly) random group of 4 would swing and 2 would sit around scratching their asses. This would still be enough to decimate guk mobs.
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