Yeah, a Big outlier except if there are other feat that come close to 5-A like 6-B, 6-A, High 6-A then it's an outlier. But if the feats happened within an age gap of the character like a manga with post timeskip,
at 12 was fighting 8-A opponents and at 18, fights 5-A opponent then we can say that the character got stronger over the years but if that's isn't the case, if the character has mechanics in place like Hulk (varies with Rage and holding back), Superman (holding back), Sentry (mental state), Thor (holding back against Mortals) then it won't be an outlier.