The problem with a lot of magic is that their power output can depend on what god/helldeity they have backing them at the moment. If we're talking about solo power no outside forces Tim Hunter is probably topping the chart at 100 in power. Also here's how I'd rate Constantine
Resources: 65-100
the man is wired into the magic community and it all depends on how they feel towards him at the moment. If he's got backing then his resources as part of the trench coat brigade+ all the favors he's owed can really put him over the top in this department.
Skills: 100
This is the archetypical skills guy for magic. He doesn't rely much on power, he relies on his knowledge, research ability, raw balls i.e. selling his soul to so many hell deities they aren't sure who owns his ass and dick sleight of hand that would make any real world magicians head spin as his enemies realize just what sort of plotting he went through to completely and royally screw them.
Power: 40-100
If I remember correctly he's no slouch in the power department and he definitely knows his stuff however if he's allowed to call in deity backing his power is whatever it needs to be and in all likelyhood could finangle his way into a position to topple Tim 1 on 1 in raw power. So on his own 40 out of 100 give him time and a drive to get more raw power or the universe collapses I'd give him a month to go beyond elder god level.
Formidability: 100
He's the Reed Richards of magic don't mess with him
here's Wanda.
Clarification: this is her using chaos magic, not simple probability altering hexes and not the life force that gave he god powers.
Resources [R] – varies depending on the definition. If it is the sum of magic items possessed Wand is 0 in this one. If it is potential of drawing more power when needed Wanada is a good 100 as she can draw power from almost everywhere to terrifying levels.
Skill [S] – 50 Wanda is trained by Agatha Harckness and had some additional training by Dr Strange, but skillful casting was never her strong point.
Power [P] – Potentially above 100 but even with her standard chaos magic abilities she was a good 80-90 with feats of resurrecting Wonderman and easily stomping one half of the Inbetweener speak for themselves
Formidability [F] – 100. Marvel Earth fears her and rightly so
Ah probably should have defined the attributes better.
Resource - artifacts, weapons, talismans, external magic source, deities to back them up, familiars, magical territory, books, scrolls and minions at their disposal.
Skill - Their competency in using spells to live up to their potential. Think of them doing as much as they can with as little they have.
Power - Their own magical power, abilities that doesn't require external aid or outside help to be optimal.
Formidability - Their worth at combat and against other aspects compared to other magical users.
by this standard my list for John is still fairly accurate. Resource wise he has the connections and favors to pretty much get what he wants iirc he was able to legitimately get his hands on a spark of creation but don't quote me on that. That said he's got favors and friends all over the world, underworld, heaven, neutral purgatories, etc etc. He has access to a hell of a lot of resources but its also dependent on who is not trying to kill him at the moment as he has the bad tendency to get put on people's shit list. The others stay the same imo.