Physically they seem to have some means to make the bodies they possess stronger as seen during the campaign. If you mean fleet numbers then it's hard to say. We do know a cruiser and snub escort was all that survived and escaped into the Omegas at the end of the Nomad War. They've already proven during the war that they can multiply pretty fast without anyone noticing. It's been a couple decades since those Wilde escaped into the Omegas so it's anyone's guess at this point.