Gus-Fox looked good in a tiny sample and it actually makes sense to me.
People balk at pairs like that and Miller-Fox because they see Fox as an offensive defenseman. He's not. He's a shutdown defenseman who happens to be a PPG player, which is very unique and valuable.
His passing is obviously excellent but he doesn't stretch the ice like a Keith Yandle or a Tony DeAngelo. He's not a very good skater. Nothing about him screams "PMD." He's world class in both zones with his transition offense being good enough.
A guy who excels at transition offense and maybe needs a bit of help at in-zone defense is a perfect partner. Lindgren, who sucks at transition offense, is not.
Lindgren-Fox is basically an old school defense-offense pair and it's not something that actually fits Fox's game. Looking at defenseman as defense or offense is bad evaluation.