J Channel Corners For Sloppy Corner?

Will a J channel corner piece fix this sloppy corner by my contractor? I am praying it does! Because I have multiple windows that are a mess.

J-channel inside and outside miters

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Having a Manufactured Home Installed - siding ok? : r/Home

vinyl siding - J Channel Looks Wrongly Installed And How To Fix

J Channel Corners For Sloppy Corner?

5/8 Gray E-Z Corners for ABTCO® Cedar Creek Siding - 8 pk at Menards®

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Union Corrugating 0.875-in x 10-ft Metal Corner Bead in the Corner