100 times isn't an exaggeration.
We are literally told in road to laughtale the haki of bajrang gun could be felt 1000 miles away.
WSG is closer to a basic acoc punch.
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It didn't drag on forever.
A lot of haki ok ? White star guns had a lot of stuff in more then just haki or size .
Not only was it faster and speed = weight = power but also it had fire in it weird white stars that we have no idea wtf they are but must be to give a dizzy effect to the attack luffy was also in buff form when he used it and buffed form is so powerfull he was toying with dragon kaido with normal unamed punches.
And like I said Kaido did not tanked bajrang gun he got beat by it .
The only punch you can compare to white star gun is the no name one luffy used that made kaido go down hold his head and ask him who he was but it was clearly a much weaker version .