I agree, though I doubt Minato has the same cohesion with the toads as Jiraiya did.
As far the sealing techniques, I think its a bit far to say that he new the majority of Uzumaki sealing techniques.
Maybe if we see him summon something as an edo, we can see how he uses the frogs, but until then, I'm going to assume he didn't have mastery on par with jiraiya.
(examples are the difference in use of snake summoning between sasuke, anko, orochimaru and kabuto.)
I think it's possible that minato has a more powerful variation of rasengan, to take out larger enemies, though I believe they would all be short range/contact jutsus, since they would most likely be created to complement his FTG.