@Light, 10 tools, each can give potentially up to 10*5*2%=100% total res to all (you cant have 2x the same stat and we are considering only max 2% res as of current tools, however the ones you buy for ingots can roll old 4% stats). He has a total of +92% res out of 100% (total of 72% is shown because of -20% earth element weakness) possible, which is perfectly fine. Interesting build, whether it's worth sacrificing so much of base stats (basically 400~of each)- it's debatable.

@edit, my mistake, there's indeed no strong element. Corrected that, sorry for misleading.

Needed to double check that, you are completely right! Sorry :)