You are basically all correct

Originally i decided to plus Odin a bit for a number of reasons:
1) he literally was my only powerhouse along with Karin (GZL came later and Ronia was practically untouched since i was levelling Karin team)
2) he was a BIG source of heal for my team (Karin teams usually doesn't have a lot of RCV to begin with and my team was underleveled most of the time)
3) i was totally out of space in the box and didn't want to buy more stones for space (it was immediately after a godfest :V)
Looking back i think he is THE reason i was able to clear so much content in a short time.... my team IS underlevelled even now and most of the members are not skilled-up or cost too much to field them together.
Between the 2k heal every round and the Odin/Ama or Karin/Odin strategies i've cleared content that by any right i SHOULDNT'T have been able to (Mechdragon's Massive Fortress and Ancient Dragons' Mystic Realm with a team under lv50 beside those 2 + siren/echidna not max-skilled? still don't know how i managed it)
Right now my "strongest" (as in with the most damage potential) team would be:
Karin (max lvl, max awak, +50)
Godin (max lvl, max awak, +62)
GZL (lv 80, max awak, +14)
Divine Queen Hera (lv 67, max awak, 2 skill, +12)
Awoken Hera-Is (lv 52, +4)
Karin (hypermaxed of Aulanticus <3)
but since the team cost would be 250 and i have 196 ( :derp:) 2 of them will always be switched with:
SGS Siren (lv 64, max skill, +12)
CLM Echidna (lv 70, 3 skill, +6)
B/R Siegfried (lv 51, +14)
TFK Kamui (lv 45, 1 awa, 2 skill, +2)
D/B Vampire Duke (lv 59)
or something even cheaper like CDK Voice >_>
EDIT: i know, i know, i should have kept my +egg together and use them one ONE mon, but at the time i didn't know any better and simply used them as exp fodder like normal :blush: