Website in codeigniter with blog and forum

Hi, I'm getting mixed messages here.

You want to use CI, but then you are saying the blog should be based on Wordpress and forum on phpBB. So the main site in CI? That means you and/or client needs three logins.

Pyro are based on Laravel and not CI. No idea what Dove are.

As a forum software can be a quite big project you may consider using phpBB as a base, and have all your users stored there. As you can write a custom login on your main site that silently log you into phpBB. And use phpBB groups to grant access to different things.
It all depends if the vendors should have a public user in the forum etc.