From what I have read about Custer even from the Civil War until the Little Big Horn he displayed very little tactical subtlety. I’ve read his men hated him and that his unit had the highest desertion rate in the Army. There was an Army leader of that period (Name escapes now!) who by far was the premier Indian fighter of the era. Primarily because he was capable of learning from his mistakes. Developed effective counter-guerilla tactics from encounters with Indian guerilla tactics. This guy brought the Quanah Parker and the Comanches to heel. Custer at least to me always seem to be applying the same tactics over & over again from Civil War to Little Big Horn. Eventually getting disastrous results.
Read up on what he did at Trevilian Station. He almost got wiped out to a man in that battle in 1864.
Same battle plan he put in at LBH. Split the forces up and attack, hoping the shock & awe win the day. Numbers & reconnaissance be damned. He didn’t have reinforcements to save him that last time.
That would be Ranald Mackenzie, who defeated the Comanches and is forgotten today, even though there was a TV show about him in the early 1960s, Mackenzie’s Raiders. He didn’t get killed by the Indians.