Heath Ledger was considered the greatest Joker of all time by Ebert, but he cannot make that decision for all critics.

Who is "he" in this prior sentence?
Ebert
Burt installed Joey's software, and he installed his hardware too.

Who is "he" in this prior sentence?
Burt
Kyle purchased three new monitors due to a recommendation by his brother, because he provided information on how his productivity increased with more working space.

Who is "he" in this prior sentence?
his brother