45% of iPad screen gone (left side) with streaks

no it's not possible it's from the video chipset only bad LCD / cable sorry

It shouldn't be digitiser related, video chip is a possibility I suppose but not sure how you could test for this.

I've found you can leave at least some of the rubber dots/spacers out if they're missing, real danger is if they move it can lead to them pushing on the screen when reassembled and this will usually distort the colours where it is being pushed.

Did you check both ends of the video cable as I have seen some come loose despite the tape still being seated over the top of them, sounds like the LCD as you said.

May not be digitizer related, but could certainly be related to digitizer repair. A good tug on the LCD cable could cause damage. I would find a reputable vendor that allows returns and purchase the new bezel clips, LCD cable, and LCD all from the same person. You're going to use the clips regardless, test the cable without closing the unit, if the condition persists use the lcd and return the cable.