Conca as a hbf? Hmm, I'm not convinced. I don't think it is the right role for him.
I'd rather see Conca be given a lock-down role deep in defence, I see him as a back pocket stopper rather than a rebounding flanker. Given the chance to apply himself to beating his opponent one on one I think his natural grit & competitiveness will come out. I just don't think he is up to the role of the tear-away HB who will rebound & then set us up to go forward with a precise & intelligent disposal.
I see Conca as a natural at the bottom of the pack throwing his body over live grenades, so lets give him a role that suits that mindset. When he is expected to run & carry the doubts get into his mind & he turns it over - as we have all seen! Leave the pretty stuff to the Yarran's & Houli's of this world & let Reece smash into bodies, tackle like a bear & concentrate solely on dominating & intimidating his direct opponent. I reckon he will develop a taste for that instead of trying to be a pretty, classical footballer dashing off the HB line ... He's not a dasher, he's a smasher!