2 types of blue ghasts?

So I was running the SAO peaca zone 4 and 5 a fair bit, and while I understand that these are event dungeons and probably shouldn't be considered in terms of the regular monsters. I've noticed there's two types of blue ghasts, some with 1000 Def and others with 0.

The 0 def ones spawn in a group of 4 alone. I'm going to do some peaca int runs later to test if this is true in real peaca, but it will be awhile, so if anyone does it before that, could you keep an eye out?

After running peaca int, I found that there were indeed no blue ghasts with 0 def like there was in zone 5. So this can all be disregarded.