If 90% of the people I follow also follow Will, chances are the Will with a good color code or badge or score is the legit Will.
Discussion
You’d still have an issue if Jack impersonated Will, but the likelihood of those things would be pretty low with significant potential blowback.
Just be careful not to create social scoring...
All clients should implement a rename feature so that people can rename followings who they care about and this should be a private client config.