I know guy and dave and I'm happy to say if they were colluding I would be extremely surprised, even with the evidence itt I still would think there is a less than 1% chance they deliberately colluded, I'm sure there is a chance they sub consciously soft played a little bit, for e.g. Guy has a pretty "meh" marginal shove opportunity but decided "ah it's my pal in the BB so il make a tight(ish) fold, I don't think that is particularly bad at all as long as it is not pre-determined and decided between in advance.
To be honest, I think it would be a terrible move - if that sort of move was under investigation and Millidonk had nothing to do with it then I think it would be pretty unfair on him. It would be down to Guy to stand up and say 'I do apologise for soft playing my mate and I'll take full responsibility for what has happened.' - Meaning Dave would get his ban lifted..... Hopefully it won't have to come to that and they are both cleared tbh, but I shan't be holding my breath as the thread starter has been 'proven' correct in what he has alleged.