Yep, I can totally understand that sentiment. I think it is unlikely that he would make the Reds side whilst Gill is around anyway.
I am not a fan of picking forwards based on height, particularly openside flankers who tend to be small in size and big in heart anyway. The bloke your username is named after would probably agree. If you have seen Gunn play you'd know his strength is his defence and presence in the ruck, being small helps him avoid opposing clean outs but he is also very good at pilfering.'That' tackle on Rod Davies at Bottomley Park was a highlight of the season.
Browning is not a 7, and never will be, so can't see how he figures into the equation. I get your point though but I am always of the belief that talent exceeds size and if they are good enough to be there, then let it be.
I wouldn't mind seeing him go down the the Brumbies for a year or two as it will do wonders for his development but at some point I'd love to see him pull on the Red jersey at Suncorp. That being said, he is still only 18 years old and has been living in Brisbane since he was a kid playing for the same club side (easts) since he was a junior. Packing everything up to move down to miserable, cold Canberra would be a big call at this stage in his career when he is still at least 2 years of Super level and the quality of the QLD domestic competition far exceeds that down south.
Who knows what offers might be around next year after another season of premier grade, the kid's potential is endless.