The wager is on! 😄  I'm biased because I never rated MJJ when he rode in the UK before and don't care about overseas form 🙈

Possibly going to announce their side at their next video night?

I'd expect MJJ to average more than Zagar. Firstly because MJJ was in excellent form last year, but also because Zagar only rode one meeting last season.

I'd be really surprised if Jensen achieves a higher average than Zagar, I reckon MJJ 6.5, Zagar 7

Tom Brennan?

The last rider should be obvious,  youngish ,able to improve.  That rules out all the other past it, over the hill guesses I'm reading here.