Did Marley Miss an Incredible Titan Engineering Opportunity?

Remember when Rod Reiss become a wild, abnormal colossal by contacting a special titan serum (most likely from a Wall Titan)?

Well, what happens if that wild Colossal were to eat any other shifter- like the Jaw? Would we suddenly have a Jaw Titan closer in size to a Colossal than to a normal Jaw Titan?

Same deal with when a Wild Titan created by Zeke inherited the Jaw Titan: Birb Person.

With that mindset established: What would have happened if Marley tried it? Giving Cart Titan serum to BRRtoldhtUUU instead of standard serum, so he might inherit the Colossal with portions of Cart's endurance and indefinite transformations? It may have resulted some *BUSTED* attrition value. God forbid that it gave him the stamina to become a swarm of tactical nukes rather than a single strategic nuke, you know what I mean?