Well also with these things, the "guaranteed money" isn't really "guaranteed". Guaranteed at signing is mostly the only thing that's meaningful, because with contracts like this, there's going to be multiple built-in roster bonuses that usually trigger either year of or year in advance. Theoretically the team can opt out of those before the date they vest, and would reduce the "guaranteed" portion of it.
That being said, even with same terms in the $170-180M guaranteed range, he should be signing. Nobody can really knock the Ravens position IF that's the true offer range.