There were plenty of signs — and admissions — during and after the Rangers opener that J.T. Miller wasn’t entirely back up to speed following a lower-body injury sustained in the preseason.

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His legs were heavy, the center said last Tuesday, and it would take time and reps before he resembled the version of the player the Blueshirts acquired in the middle of last season and named their captain over the summer.

But slowly, and then more rapidly, Miller has started to showcase that.

He collected his first goal late in Thursday’s win over the Sabres, and then Sunday , skating alongside

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