Purdue's resume is very similar as far as what they did OoC, they've already lost the head to head with MSU, and there's nothing else that can really be accomplished in conference that would warrant them being a 1 and MSU a 3.
Similar, but 5-3 against Q1 instead of 3-2 and an extra Q2 win. Plus better predictive metrics (top 4 KenPom). Mich St. game was at MSU and 3 point game (aka MSU gains no edge for that when accounting for home court).