being diamond can be achieved 3 ways that require super different skillsets
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main support. know how to support
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main mid or top. know how to crush lane.
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main jungle. know how to read the map to know where everyone is so you dont die. the primary power of a jungler isnt even ganking. its not feeding while farming. as long as you dont feed while farming, you win as jungle. as such i believe jungle is the easiest role to get to diamond with
in my opinion "objective based play" is NOT how to reach diamond
you reach diamond with farm based play (for jungle or mid/top). farm based play COMBINED with being stonger than your lane opponent and being able to kill him while never dying yourself
kills are the objective. diamond players are better than silver/gold/plat players at knowing how to get kills for themself and prevent the neemy from getting kills
after kills farm is the next objective. and nothing else matters. only FARM and KILLS matter. the rest comes from that