You guys are not considering the fact that this gives Kyren more time to prepare for the combine and improving his own personal game. He will not have to attend meetings. He can cut weight (or whatever helps him) to get to a sub 4.5 for the combine etc.
You can call this selfish, and it largely is. However, this is the nature of the beast. The precedent has been set, and accepted. This is not the same as quitting midseason. This is quitting at the end of the season and before your "bonus game".
But, if we want to bring in top talent, we need players with aspiration of making money in the NFL. This is what the elite talent wants. And frankly, it's what they deserve. If they play their ass off for 3 or more years at ND (like Kyren, Kyle, etc) then they deserve to make whatever decision they feel is right for themselves and their family.
Additionally, if you don't think their teammates don't understand this, then you are crazy crazy off. Listen to Outside of the Garage. Listen to the guys that know this is a business. These kids are smart. They know their clocks are ticking and have to optimize their time while focusing on their individual future.