I am assuming you refer to the side track Grfe4.That indeed can...

I am assuming you refer to the side track Grfe4.
That indeed can be a factor for drilling overbalanced, in addition to the mud tank agitator and/or mud density composition sensor reading, which SM mentioned where faulty.
Strangely enough I recall mentioning of strong gas kicks while drilling the ST, possibly that doesn't square up with an overbalanced mud weight.
Not sure could be that MW was very inconsistent throughout the MK-1 drill campaign ?
I am assuming that the last thing SM wanted with MK-1 was an accident, potentially with loss of lives.