well there was a tentacle coming out of his face
Yes he was, but Thel killed him mid infection. If the flood sticks to its normal workings though, as seen in halo three, living or dead things can be reinfected by the flood. Its why you have to burn/destroy the body to stop the Flood. So I see no logistical problems with him being flood now. But that might be stretching it kinda far for the fans, so my bet is that your never gonna see him again.