Of course it is. Why do you think when you only fight one, it appears in a fixed corner [as to be able to fit exactly 4 in two rows of two] as opposed to the exact centre, like a normal "one at a time only" monster would appear [ie. something like Garland appearing in the middle even though his sprite is small as shown here]? I've seen this happen myself though, which I described earlier, yet you claim that it isn't possible. I feel like you're trying to insinuate that I'm a liar.
Don't laugh at my character names, I had to think of names with only 4 letters maximum to work with.