Personally I think Latu could evolve into a great modern-day lock.
Attack, he can bite into the line and offer an exceptional passing game (right to left), ??? on his left to right. Plus once he's got full confidence in his hamstrings, he's deceptively quick with short, fast strides that could open a team up not knowing whether he's going to pass or run.
Defence, he has great tackling technique & apparently pound-for-pound is one of our best on the wrestling mat. He often goes waist/legs height so another middle can go higher in the tackle.
Talk, he doesn't have a great voice yet on-the-field so this isn't such an issue at lock.
Someone like Latu could create massive width for us on set plays with long, fast link-passing creating space for Luai & Galvin to work their magic.