From: Jurai-Knight

This Earth is supposed to be an approximation of Standard Ranma
Storyline, but Hinako wasn't there that early on.

And since you mentioned that Ranma's mastery of the Amaguriken was 'recent',
isn't it too early to have Ukyo too?
And is the Ranma of 1-397 the one that got thrown in jail? Since 1-001's
Ranma will be doing his short multidimensional hops in a day or so, doesn't
seem likely...