Would've worked out far better if there was a bit of a time lapse after Shredder got hit with the BOOM and got exposed to the ooze. Like, they thought he was dead right there and/or couldn't find a body. Then they're celebrating later on and there comes SuperShredder, presumably with armor he's had time to make for his new hulking body.
As is, dumb. There is no explaining it.
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