We'd only have a spot for Proctor if we gave him Guerra's spot, and I don't see the upside of that.
Proctor is only a year younger, is about the same level of player, but would want more money and would take time to fit into the player group, and would also want a multi year deal.
Guerra for reasonable money for 1 year would be a much better signing.
That's assuming we don't want to give that spot to someone young, since we have a pretty experienced group of second rowers in Frizz, Fitz, Sione and Barnett.