Without shenanigans,* any candidate will need 217** votes to be elected as Speaker. So the Republicans can only lose four votes.
Dozens (i.e., more than four) of Republicans have publicly said they won't for Jordan.***
* And too many shenanigans might inadvertently result in Jeffries' being elected.
** Presently two vacancies.
*** And why would they, when there's a Speaker pro tem., already able to gavel slam.