He wasn't withholding his services:  SCB statement.

Two of the Aces top 3. Jason Doyle & Zach Cook required in Poland. 

Difference between when a club declares a change and when they ride, what’s to say Jacob wasn’t going in at Scunny anyway and then Dan was unfortunately injured Scunny then using these injuries rather than performance as the reason for the change in their press release. Same with Poole their new lineup with Lightcap could have been presented to the BSPL on Friday or Saturday prior to the Berwick match, from memory a change has to be decanted three days prior to the rider making their debut although I’d need to double check on that one  So in essence if Glasgow had/have redecorated their side prior to Friday then it would be ok, albeit giving the quotes from Cami it would appear that isn’t the case 

He will be impressed by the size of the crowd, I imagine he could put a few on the gate as a young, promising,american speedway rider is a rare thing.

Yes well done, good prediction, young promising rider who should do well.

Conspiracy theory! Maybe Oxford knew that Kennett wasn't giving his all for them, so waited for Poole to sign a replacement before bringing Riss back? They're way of not letting Kennett take advantage of them?