I think Heggem is better at getting in behind than Styles is. When Heggem recently played LB, he got in 3 or 4 really dangerous crosses.
Furlong is only useful if he's in tandem with a proper right winger. He has a decent partnership with Fellows. On his own, he can't create much going forward.
However in a 352, the wide players should be covering the full length of the pitch, but they can't properly. Grant is good at getting back, but he usually fails to get past his opposing back.
I come back to my original point, that we need a midfield that effectively supports Armstrong. That means not only setting him up with chances, but also getting on the score sheet. Players like Gera, Koren, Koumas and Morrison were regular scorers. From our current squad, Price is the only payer who could become as useful, Swift can on his day, but there are no other regular scoring midfielders.