The original thought was he would be on a 4.00, but the Regulations say that riders with Ekstraliga experience start on a minimum 5.00, and that was imposed. I think, although not sure, the Witches had to re-jig their team plans because of their incorrect assumption.
Overall, I reckon 5.67 is a decent average for a rider who had a tough learning curve at Foxhall - his improvement this season was tangible.
I'm with others in that: i) I agree signing Brennan was a no-brainier, and ii) I think Rew was more likely to have been retained - with either King or, most likely, Ellis, making way. From Louis' comments, Rew played a part in the decision for him to move on.