Roof Sag in Flip - Inspection Issue

[Andrew Joseph]

I just purchased a brick bungalow built in the 1920's. When reviewing the purchase further, I noticed that the roof had significant deflection (approx 6"-8"). When getting in the attic, none of the rafters are broken, just deflecting. I don't think there is any issue with failure given its performance for the last 90 years. I'm just wondering if this could potentially haunt me with a retail home buyers inspection. You really can't notice it from the attic, just the exterior of the house in a couple spots (valleys are the places were it deflects the most). Has anyone had an issue like this with a retail buyers home inspection coming to haunt them?