<2.65: Snake Melascula, Critical Over Galand, Gloxinia
At most 2.65: Drole, Morning Escanor, Monspeet (maybe)
3.3: Demon Meliodas, Derieri, Zeldris, Monspeet (maybe)
At least 3.3: Estarossa/2 Cs Estarossa, God Zeldris, Tarmiel (vessel), Sariel (vessel), Meliodas (Post-Revival), Cusack, Chandler
~4.3: Post-Revival, Vessel Tariel & Sariel, Meliodas (Prime Base)
>>4.3: Late Morning/Early Afternoon Escanor, Assault Mode Meliodas, Tariel, Sariel, 3 Cs Estarossa & Mael
>>>>4.3: 4 Cs Mael, Ludoshel (Margaret), Zeldris (extra god?), Transformed Cusack & Chandler, Near-Noon Escanor
>>>>>4.3: Original Demon.
>>>>>>4.3: Ludoshel, Crisis Original Demon
>>>>>>>4.3: 2nd Demon Mark Zeldris, The One Escanor, Original Demon
>>>>>>>>4.3: Near-Noon Sunshine Mael, Prime Demon Meliodas, Elizabeth
>>>>>>>>>4.3: Full Wings King, Ban, Meliodas Demon King/Early Zeldris Demon King
>>>>>>>>>>4.3: Demon Emotions Meliodas, Transformed Demon King, 50% Demon King, Supreme Deity
>>>>>>>>>>>4.3: 100% Demon King/Full Power Zeldris DK/Brittania DK, True Magic Meliodas, 100% Supreme Deity, Ultimate The One
Possessed Tarmiel and Sariel are so low on the totem pole because Estarossa was about a match for them individually with Galand's decree.
Prime Base Meliodas was stated to be on par with the Ten Commandments by Diane, but it's likely she's referring to them as an overall group since they have vastly different power levels.
The Demon King apparently wasn't that much weaker than the Meliodas body when he first possessed Zeldris, which is strangely consistent with that dumb movie.