That’s some top level conspiracy theory.

First, Who shoots someone just because of “connections”? Why not go after the church itself?

Further; this person got two shots off over a 4-5 second period. Just walked up to one of the most powerful politicians in Japan. I personally feel there’s something more to this — gross negligence or a conspiracy idk.

The communist opposition was actively calling for his overthrow by any means and calling him hitler (reminds me of the USA frankly). China has been celebrating his death.

Even if we assume this person believed this (highly speculative), then it was likely amplified by Chinese propaganda. China, USA, Russia, etc is known to support opposition parties and amplify conspiracy theories to support their aims.