User blog comment:B214/Talk About What You Want! 2/@comment-74.77.52.225-20140801025045/@comment-1359322-20140801160726

I not talking about Issei not being able to form his team. I'm talking about the time factor.

Before forming his team, Issei needs to get his territory build up everything for his territory before he can start searching for servants, there's no point forming a team if you can't take care of their well being after all. Also Issei can't depend on any outsiders when doing it, not the Gremory, not the Bael, not Grigori. No one, since the one that is going to make use of that territory is Issei, so no one will give Issei any support on forming those things, remember the Gremory's asset belongs solely to the Gremory, if Issei wants to start anything of his own, it's all on Issei's expenses, the Gremory won't support him. You think Grigori or the Heavens are going to like, oh we'll give you money to build this and that for your territory. There's no way that's gonna happen.

Also the only support Issei may get from outsiders are sponsorship on Rating Games. Aside from that, you can expect that Issei needs to cover all expenses of his future team on his own.