Sorry to take issue with what you've written, but are you able to provide any factual information or statistics to back up your assertions there?
Were you party to the details of the negotiations between Flybe management, SOU and BOH? People have speculated that Flybe's strategy was to force a better deal from SOU, but speculation doesn't necessarily equate to fact and the only people who know what went on in those negotiations probably won't be posting on here.
Even if BOH loads were better (which I doubt), it's yield that matters, not load factor.
Are you sure no Flybe BOH flights were ever cancelled? Got the stats?
I'm aware of occasions when Flybe have combined flights into or out of SOU (and other airports), but only in cases of technical problems causing flight cancellations or recovering from schedule disruption. e.g. fog or airport closures. It's fairly standard practice. They are a under a bit more pressure at SOU because it closes overnight, so it's very important to them that they get all aircraft in before closure to prevent more disruption the following morning.