With some work flash could definitely be a very dangerous roamer (or pocket for that matter) next season. I can't really comment on his scout play as I haven't really seen him, but I have seen him a ton on soldier. His DM is rock solid, and while his timing on bombs/countersacking could use some work, he executes on positioning very well. He's always been a good friend of mine and takes criticism very well. Teams who need someone to push them will be especially benefited from picking up flash, as he's pretty straightforward when giving feedback to his team and isn't afraid to call people out. He's very smart in the driver seat on pocket, and thinks on his toes. That being said, a team that can't handle his aggressive calling may need to stray away. His bold attitude in a scrim/match environment has often times been a challenge for certain teams who don't benefit from having that kind of team member.
If your team is lacking in leadership or needs a dedicated soldier, flash is your guy.