He is mostly playing pos4 Rubick.
He build Aether Lance without dissasembling arcane boots.
He never builds shard.
He has almost never bought a forcestaff or a dagger.
He thinks that having undying Q as a stolen spell is good.
He always buys Cloak + wind lace + wand + raindrop and only then he starts building his items.
He doesn't look at the minimap, has 0 clue about teammate skillbuilds, items, mana/hp/ulti status.
He usually buys Aeon Disk because he is afraid of dying.
He almost never builds forcestaff or Shard.
He never focuses to save his cores, only his carry.
He usually finished the game with less death on our team when we are losing.
Sometimes I watch his games and I get mental traumas because there are no real smurfs in his games, and he plays ultra bad making ultra sad mistakes. He never listens to me.
At this point there is around 3200 MMR difference between him and me. (I'm 5200, he is 1900). He says MMR don't matter and that we both make mistakes. So I am in no place of giving him tips.
How do I help him? We cannot play ranked together anymore. I increased my rank in the last year and the MMR difference is too big.
I will probably send him the link of this thread. Please let us help him.
Source: https://www.reddit.com/r/DotA2/comments/xk5lrk/help_my_friend_has_deranked_from_ancient_iii_to/