With mind powers, definitely Grodd; they aren't the make-or-break, in and of themselves, but coupled with Grodd's massive physical advantage in strength (and being at least fast/agile enough to keep pace -- something many people forget about: Grodd is actually relatively fast/agile, combat-wise, when he chooses to be), Grodd will take the clear majority on that scale.
Without any mental powers, it becomes more problematic: Logan would have to use his applied jobber-aura (which is one of his best powers, right after healing/recovery) to compensate for Grodd's strength/physical prowess, though Logan is a better fighter, and the claws can definitely give the gorilla the what-for (also, Logan's history of taking it to physically more powerful characters who "credibly" should beat is ass, truly is a power, almost up there with Captain America's). But if things were taken "evenly", I'd say Grodd at least splits -- Logan *has* to not let Grodd get his mitts on him, or it's over; he'll get pinned into unconsciousness.
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well with Flash, flash thinks to fast for Grodds TP to control him for long or for illusions to take hold..
Flash tends to see through the mental illusion due to how fast his mind thinks and Grodds suggestions and illusions not being able to keep up.. its more of a nosense to flash.
with Dick Grodd did mind f$## him.. but it was to show him his worse fear and have him be tormented.. Dick was just to strong willed and knew it was an illusion..
grodds TP isnt actually telepathic control like Xavier, betsy, cable. its more like a mix between scarecrow/mysterio more often then not.
Flash can outrun TP attacks, no joke, he did it in Blackest Night with Martian Manhunter. The rest is plot I guess, you could also ask why Supes isn't shitstomping the entire earth villains after a short vacation in the sun.
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hype? he blocked am cosmic level beings telepath with his "hype" TP blocker.......not to mention he no sold emma frost and cassandra nova telepath amoung many others.........(though wheldon never got the memo, but at least he admits he has no idea how to write wolverine)
No sold Emma? Are we taking one incident into account here, or maybe Emma's long standing history of being able to do whatever she wants with Logan whenever she feels like it. She's outright stated that his "level 9" (already with arbitrarily never explained power rankings) psi blockers were inferior to her "level 10" telepathy. No idea what cosmic instance you're talking about, I'll look into it or whatever.
Getting back on topic, Grodd was ****ing with Swamp Thing and the like.