Re: Will the SH ever get a big group?
He already has a huge NAMED army at his side:
* People from Arlong Park and Johnny and Yosaku
* Koshiro and Zeff and their students and chefs
* Giants from Little Garden and maybe in the future Elbaf
* Kureha, Dalton and his army from Drum Island
* Alabasta Army, pell and the Jackall
* Skypedians and Gan Fall
* Galley-La and Franky family, possibly CP-9
* Timeskip friends (Hancock, Ivankov, etc.) Maybe Mihawk.
* Fishman princes and king, Ancient weapon Shirahoshi.
* Some enemies turned friend, Crocodile, Mr. 1 2 3, Buggy etc.
So maybe not all of them will show up, but I think most of them will make a re-appearance in some kind off big final war against the corrupt/absolute justice branch of the marines.