Notre Dame being Notre Dame, and based on Big 10 prior interest in UNC and Virginia and the population/market/television sets involved, I assume these three would be full share Big 10 members. I don't think FSU and Clemson deliver big media markets. Are they national brands that would warrant a full share? I don't know. They've certainly been successful on the field but so has Oregon.
Stanford does not warrant a full share if it warrants an invite at all. San Francisco and the Bay Area are a huge market, but nobody seems to care about Stanford and it isn't a national brand. I think the only way Stanford is in the Big 10 is if Notre Dame says we want Stanford. Otherwise, I think Stanford would have been part of the USC acquisition. Reports are that it was USC alone that approached the Big 10, not USCLA. While there's a strategic case for grabbing UCLA as well, to push the Pac 12 out of the LA market, it would have made some sense at the same time to grab the huge SF/Bay area market along with USC, assuming there is actual value in college FB and to a lesser extent college athletics in that market. My assumption is that the SF/Bay area is not a great college sports market and Stanford/Cal are appraised as underperforming sports properties.