Goo Bot Rant

Did anyone notice, that they don't spawn/call/summon their little botfriends when there is another goo bot around? Or was it just in my toy box? There were only two of them and all they did was shoot pink goo at me.

Between my two at the first checkpoint upon entering Zurg's fortress, they created a small army, John.

^ Really? I wonder why my goo bots didn't do that. Is it maybe because i spawned some other big Zurgbots at the same time? Have to test that later.