@Dark I was thinking something like this to make it a bit more exact if 3-C+ Buu Saga SS3 Goku gets accepted.
4-A: Toeiverse Buu Saga SS2 Goku, Base Janemba, Base Hirudegarn, Tapion, Pikkon, and Second Coming LSS1 Broly
3-C: Base Trunks, Pan, Ledgic, Natt, Ribet, Bizu, Nezi, and Oceanus Shenron
At least 3-C: Super Mega Cannon Sigma, SS1 Trunks, and Baby Saga Base Vegeta
Possibly 3-C+: Grand Supreme Kai
Likely 3-C+: Baby Saga SS1 Vegeta
3-C+: Toeiverse Buu Saga SS3 Goku and South Supreme Kai
At least 3-C+: Super Janemba, Transformed Hirudegarn, Baby Saga Base Goku, Uub, Infant and Teen Baby, and Base Rilldo
3-B: Toeiverse Buu Saga SS3 Dragon Fist, Baby Saga SS2 Vegeta, Hyper Meta Rilldo, Meta-Rilldo, Fusion Reborn Gogeta, Baby Saga SS1-SS4 Goku, Super 17/Shadow Dragon Saga Base-SS3 Goku, Super 17/Shadow Saga Base-SS2 Vegeta, Majuub, Adult Baby, SS1 Baby Vegeta, Strongest Form 1 and 2 Baby Vegeta, Golden Great Ape Baby, Hell Fighter 17, Base Super 17, and Shell Form Nuova Shenron, Post-Training Hero, and Ultimate Shenron
At least 3-B: Super 17/Shadow Dragon Saga Pre-Limit Break SS4 Goku, Pre-Revival True Form Nuova Shenron, Eis Shenron
Likely 3-A: Post-10x Kamehameha Absorption Super 17 and Base Dragon Fist
3-A: Shadow Dragon Saga Post-Limit Break SS4 Goku, SS4 Vegeta, Syn Shenron, Post-Revival True Form Nuova Shenron, SS4 Dragon Fist, Universal Spirit Bomb, Omega Shenron, Dragon Ball GT Gogeta, Post-2nd Training Hero