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Mr. Bean, Castform evolves into Castorm entirely due to a lack of research on the part of the Suggestor AND the Staff at the time. Castorm is posited as an ancient mythic creature, while Castform is canoncially a synthetic pokémon, created from scratch by the scientists of the Hoenn weather research institute. As for WHY Castorm is a dragon, that's purely due to the badass factor.

With this suggestion we have similar circumstances. An implausible firey-water blob evolves into a pair of awe-inspiring legendary monsters purely because they are hoped to be cool enough to compensate for the mediocrity of the first form. It's my belief that the two evolutions would be much better off not being related at all, instead simply being unevolving counterparts.
Another point I'd like to bring up is how at the moment, with the water one being a whale-fish thing and the fire one being Yet Another Dragon, that they scream out their role as "Groudon and Kyogre lite edition". Being pokémonified versions of behemoth and leviathan is not a bad thing though, I especially like the anchor-head idea on the leviathan-mon. What I think would be best in this case would be to make the behemoth-mon not a dragon, and more of a bull, to fit in with the classic design of the beast.