OK, just me. You gotta follow your own instincts here, but I'd go get him. I'd put him with the GSBR pullets and get crackin'. It's early, carpe diem. But, goodness. If those GSBR pullets are laying 4 eggs each per week, you could gather 10 or 12 viable eggs and get started. If you produce 30 chicks from that mating trio, then you could start rotating him over his sibling females, the very best, and do as Scott suggested. I don't know about your experience with the heat and humidity, but in KY, we've got to break it all up by early May.
Got a feeling your experience would be similar.