The problem with Tommy is that he's not playing with continuity at Perpignan and, as much as I know, still having poor kicking rates. I think Brunel trusts a lot in Tommy (he's the one who strongly wanted him to wear Azzurro) but the first aim in the yesterday's match was the victory and that's why he chose a more experienced guy, even without international caps, as Haimona.
Probably we'll se Tommy next week again Argentina.
Anyway, I think Allan will be for sure one of our options at flyhalf in the next future aaaaand, thank you for growing him for us

(tbh I think you have much more valid options than Allan in your national team)