The tackle position comes down to how Poles views Jenkins and Borom. If he has a positive outlook on them, it would make more sense to bring in a marginal starter / solid swing tackle than pay someone like Armstead.
Turner makes a lot of sense to me because of his versatility. I'm not a fan of Fischer, but he'd also fit that low end starter criteria to round out the tackle group. You can still draft a tackle high in this scenario.
I don't think a lot of fans craving a splash singing are looking at overall roster construction right now. Dan Pompei's article about Cunningham was illuminating in a lot of ways.
Personally, I like how the Bears front office is approaching free agency. It may not work out, but their disciplined approach is good strategy.