It's really a matter of the ladies. Both of those candidates are much more acceptable to Republican women and represent key states that a Republican must win to gain the Presidency. Trump rehabilitating Rubio with an apology for making it personal, might go a long way with some women. It is certainly worth 490 apologies to turn around the country, if one loves the country enough.
But it might be a moot issue. Apparently the 172 is I-72 and refers to U.S. Citizenship and Immigration Services (USCIS) forms. See article below and note following:
Cruz's ballot eligibility is also being challenged in California, Maryland, Montana, Nebraska, Oregon, South Dakota, and Washington.
Though none of us know if Trump has anything to do with this and no one is sure what the 172 or I72 bit is so I guess we wait.