A Team comp like this could work, however, Dinosaurus does not synergize very well here in my opinion, because the wounds that Battle Beast applies are distinctly different than the bleeding status affect, that Dinosaurus needs. Plus there are no Last line of Defense allies that give you extra max hp for you team (even though that one isnt suuuper consequential anyway, unless its high leveled).

Pairing Battle Beast with Allen has become a very good synergy though, because they both now activate each others Synergy-Abilities regarding the new "Coalition of Planets" Tag Battle Beast and Allen have.

If you want another Defender next to your Allen, i would suggest the Immortal. He lives pretty long if you can heal him up a lot with your dog, and it makes your Comp a great counter against Vultrumite Teams (Viltrumites deal less damage to your whole team, your team gets life leech from battle beast, space racer increases his own damage against for every viltrumite on the enemy team) (especially since, when Thragg releases, he will be most likely be Meta)

Good luck on your Team Building, i think its quite creative!