A rebuild doesn't require you to get rid of all of your players and start from scratch. Teams are no more likely to succeed by getting rid of everyone before rebuilding over than keeping some players and rebuilding. It's been done successfully both ways and usually takes much longer when you get rid of everyone and start from scratch. Frankly the entire concept of a "rebuild" is just bullshirt talk used by teams to try to stop fans from expecting them to win games. All NFL teams are trying to build a winning roster every year. Some do it and some don't. Calling it rebuilding is just an excuse for sucking.
But thanks for another rant about Loomis when I didn't mention Loomis and I would personally prefer it if he was no longer the GM. But, please don't let that stop you.