What doesn't make sense is assuming the lunarian qualities need time to mature. Serahawk and Seracock were kids too yet were dispatched on an official mission. What kind of growing up are we talking about here? Jimbo already controls his fire and uses his fruit decently. Seraphim are not pure lunarian DNA but a complex machine with various tech regardless wether their lunarian DNA is the dominant one or not.
The lunarian traits are already activated from what we saw, but he's still not immune to lasers.