If you are wondering why particeps is not accusative after fio, than yes, it acts like esse. It can take a predicate nominative.
Yes that was what I was wondering. It seems like an easy question, but I haven't come across fio a lot actually...
One more question, if that's alright:
Nos autem fortes viri satis facere rei publicae videmur, si istius furorem ac tela vitemus.
How is the subjunctive used here in vitemus? Vitamus makes sense, but lectio difficilior suggests vitemus (iirc, some manuscripts have vitemus and some have vitamus).
Dolor poetas creat.