At King level and higher the AI gets extra starting units, 1 or 2 defense units and 1 exploring unit.
For the Shoshone all units will be pathfinders which means 2 pathfinders at King, 3 at Emperor and 4 at Immortal and Deity.
Spoiler shows 3 pathfinders at Emperor.
A lot of stuff in civ5 is imbalanced (starting locations, natural wonders, etc.), but this is imo clearly overpowered.
For the Shoshone all units will be pathfinders which means 2 pathfinders at King, 3 at Emperor and 4 at Immortal and Deity.
Spoiler shows 3 pathfinders at Emperor.
A lot of stuff in civ5 is imbalanced (starting locations, natural wonders, etc.), but this is imo clearly overpowered.