Yes, it is a matter of patience because he's only really broken out offensively at 24 years old in his 6th nhl season.
I'm not talking about patience to see if someone is ready to play at the nhl level. I'm talking about patience in terms of blossoming. I see a lot of comments frustrated with Harris, and others calling Barron soft, and Guhle weak. These are kids playing a position that takes a few years to settle into.
As for the rest of your post, isn't sheltering him behind better D man an actual plan though? They had the luxury to let him develop in that way and it worked for them.