Grinding threads with myself? LOL

SO I was wondering if I’d be able to grind out trade threads with myself? Would they still count? 
Like for example: threading with Kyn and Alduin for Merc trades.

I was told that as long as my other PM approves, that it might be alright. But I wanted to ask just to make sure.
(I feel like it should count cause that’s twice the work for me LMAO)