Same reason they want blue Odin, but red. 3 rows, 3 skill boots and a ton of stats.
The thing is Bodin has perfect synergy with Bonia, whereas Rodin is an attacker type.
I guess people really like him on Shiva? Or just as 2 row.
If we compare him to Ronia, he offers 2 extra skill boosts and 2 extra rows and stats at the cost of a subtype and a much worse skill. If we compare him to Belial he offers one extra row and skill and stats for the loss of subtype.
It's currently too late for me to do some calculations, but I would like to see how a loss of a 6x multiplier and the loss of a potential baddie measures up to overall damage.