If that is to be the rule then watch every pitcher use everything they can in inning #1.

the rule is if you have too much sticky stuff or the wrong stuff on your hands you are ejected. Period.

That’s the rule for foreign substances, not rosin.

The rule on sticky substances states that "player use of rosin always must be consistent with the requirements and expectations of the Official Baseball Rules. When used excessively or otherwise misapplied (i.e., to gloves or other parts of the uniform), rosin may be determined by the umpires to be a prohibited foreign substance, the use of which may subject a player to ejection and discipline. ... Moreover, players may not intentionally combine rosin with other substances (e.g., sunscreen) to create additional tackiness."

The rule on sticky substances states that "player use of rosin always must be consistent with the requirements and expectations of the Official Baseball Rules. When used excessively or otherwise misapplied (i.e., to gloves or other parts of the uniform), rosin may be determined by the umpires to be a prohibited foreign substance, the use of which may subject a player to ejection and discipline. ... Moreover, players may not intentionally combine rosin with other substances (e.g., sunscreen) to create additional tackiness."

[Pitch coach Matt] Blake was one of the Yankees personnel who went over to feel German’s hand shortly after he was ejected.

“It just felt sticky,” Blake said. “They weren’t wrong — that was too much. I don’t know what he was doing to apply it, but you cross the line on their end and I couldn’t argue with it.”

Asked if [umpire crew chief] Hoye was wrong and it was just rosin, Blake said it was “hard to say.”

“I try not to venture into the speculation of it or where it came from,” Blake said. “They said it was too sticky and it was.”