I agree with this in theory, although I don't think they need to be all that "adamant." I think they're confident Ford will continue to develop. I also think Ford grew comfortable in his role as last season progressed. And, if Ford is a better G than T, the same might be said for Williams.
I also suspect that the acquisitions for such a deep O-line unit may have more to do with the possibility for attrition due to Covid-19. Offensive, and defensive linemen are certainly the highest risk players on the team as they are in close, face-to-face contact with opposing players, and many of them are technically obese. I would not be surprised if, in practice, they were moving players around the line a lot for this reason.
But, I still think, at least for the start of the season, they are going to place a higher value on continuity than they would for other, more typical seasons.