DQMJ3 Pro Ride Fusion and stat boosting skills, traits, and Unity abilities/traits

Yesterday I realized I had no clue as to whether I should be adding stat increasing skills onto the secondary ride monster for ride fusion, and after not getting a response when asking about it, I tested it for myself.

I tested with a Cavorting Column (CC) as my base monster, and a Bilhaw, Skelebat, and Brimstone Bulb, for their abilities.

First, I checked to see that ride-fusing C C and Bilhaw would give me an HP of 533 and an Atk of 262. Then, I leveled Atk boost+ on Bilhaw, getting +14 HP and +14 Atk. The resulting fusion then had an HP of 540, going up 7, half of Bilhaw's 14. The Atk only went up 1.

Then, I leveled Atk boost on CC, getting +18 HP and +22 Atk.

The Atk went from 263 to 287, going up 24 for the 22 gained from Atk boost, and HP went from 540 to 558, going up 18.

Then, I fused CC and Skelebat, saw an MP of 247. Then, I leveled MP Boost on Skelebat for +80, and fused them again for an MP of 287, or +40.

Lastly, I fused CC and Brimstone Bulb, and checked for an HP of 568 and an Int of 317. Then I leveled Wisdom boost for 18 HP and 44 Int. I fused them again for an HP of 577, or +9, and an Int of 322, or +5.

So, it seems that the result of a ride-fused monster gains 1/2 of the boosts to HP and MP gained, and ~1/10 of the boosts to Atk and Int (and presumably Def and Agi as well) gained from Stat increasing skills on the secondary ride fusion. So, it seems that for an optimal ride fusion, you should put all of your stat increasing skills on the Primary monster, and ability skills on your secondary monster, as the stat bonuses will not benefit you nearly as much, except perhaps MP boost, since +40 MP isn't anything to sneeze at, even if it isn't optimal.

This bit may not be new to anyone, but monsters don't inherit the secondary monsters traits or union abilities, so your primary monster should always be your strongest, both in stats and in traits and union abilities. Your secondary monster should focus mainly on Skills, and then on stats.

This was very fun to do, and I hope it benefits somebody who is also curious about this!

TL;DR, don't put Stat boosting skills on your secondary ride-fuse monster, put them on the primary one, it's objectively better.