The problem with coaching is, what works for one, doesn't work for all. What made Boyd great at the game, plays to different strengths than what Walsh has available to him. Walsh is electrically fast - but his passing game is weaker than Boyds - as an example.
With the speed he has, his positioning can (and should be) completely different to Boyds, where Reece can start inside a defender, and burn them around the outside.
What he really needs to focus on is how to sell a dummy, how to draw in two and put someone through with a sweet pass - and when to light the jets and push through a gap even if he's likely to get tapped on the way through.
A few times in the last two years. He's pushed a pass close to the line where momentum and his pace would have easily put him into the in-goal. Boyd never had those wheels, so unless he's developed really mature analytical skills and people management skills to compliment his game knowledge - there could be better options out there.