I see Ciro Gomes has switched parties yet again, to the PDT. Amusingly, the same party as his Senator ex-wife. Did PROS stop existing?
No, it didn't. Ciro Gomes is the proof of why Brazil's multi-party system is broken. PDT is the seventh party of his political career. Remember, Ciro Gomes himself created PROS when he was unhappy that PSB wouldn't support Dilma's reelection. Then when the PDT offered him the possibility of running for President in 2018, he didn't think twice about making yet another switch.
By the way, here's what Ciro Gomes is up to over the last few weeks:
https://www.youtube.com/watch?v=eKCbn4aOhDw
Your comment about Brazil's "broken party system" has made me curious. Could you answer these questions:
1) How many of the parties actually have coherent ideologies? Which ones?
2) I kind of get the appeal of PMDB, but why would one vote for one of the smaller non-ideological parties? (Clientelism, individual politicians?
3) How would you (or any of the other Brazilians) change the electoral system to fix the broken system?