Well don't know much about Jurrac you see, but by the BA we had, I see that was very possible to put aeolo on the field with another lv 4, so maybe a catastor would fit the extra, however, think about having things like Duality, Maxx "C" and Veiler, mainly maxx "C", because it could add some draw power to your deck, and also, extra consistency with duality and protection with veiler, I don't think any o these are REALLY necessary, but consistency is consistency, however, nice deck, a alternative way to use Laggia and Dolkka other than Dino Rabbits/Guide Rabbits etc.
BUT, Maybe you should think about not focusing too much on Dolkka and Laggia, in the end you could have stalled nicelly with Maestroke instead of Dolkka.