Misfire on single cylinder TB45E

I am still searching.

Here a theory as I am running out of options (and now under time pressure as I should start a safari trip in less than 10 days)

My mechanic today mentioned that the misfire started on the test drive first on cyl #4 then moved to cyl #3 and now persists on cyl #2.
He also mentioned that at some stage used compressed air to clean out the inlet manifold in the process before the compressor was remounted after the bolts repair. (on the support where normally the throttle body is mounted)
Bolt's thread was damaged in the aluminium.

Now, me thinking.
If there would be some debris inside in form of a piece of paper label (similar I found 1000 kms ago in the air flow sensor body) and that made its way through the throttle body and the compressor and then moved around in the inlet manifold, depending on air flow turbulence, now finally lodged firmly in the pipe of cyl #2.
We don't have the normal vacuum in the manifold, but compressed air from the compressor at say 0,8 bar.


What would happen.
1st fuel injection timing is given by the computed airflow reported to the ecu from air flow sensor, so the mixture is optimised.
Now based on my assumption of blockage or partial blockage on cyl #2 the fuel - air mixture is rich, it would over fuel by the missing air volume. (all cylinders get the same injector timing hence fuel volume).

The cylinder would fire but with a less efficient mixture thus "limping" or misfiring.
That is what I think I see, maybe not a totally "dead" function but less than optimal.

Now as said, my theory what is your take.

Any consideration welcome.
Thanks