Can a MFJ amended to MFS be amended back to MFJ? (reason only one spouse amended before due date, and if the secondary tax payer's claim is denied for late status change).

Filed MFJ (1040) where spouse is the secondary tax payer. Amended MFJ to MFS (1040-X) for primary before due date. Secondary filed 1040 after due date (assuming the original 1040 will be now adjusted to MFS and can e-file for secondary). Can secondary's MFS return be denied for late filing status change from MFJ to MFS? If so, can primary amend again to change back to MFJ?