Right, you just need to know what guys aren't going to make it so you can draft seniors instead.
It's easy.
I know how the draft works, but the idea that you can just draft and sign anyone you want and make the money work just isn't accurate. There is a cost to burning picks for savings. The math won't always work.
Assuming Lawlar would have signed for the same amount if picked fifth instead of sixth (which might not have been the case) you would need to get together 1.8M in additional funds. Assuming they didn't go over, the 5% overage will get them 591K closer. You still need to cut 1.2M out of your draft class.
I guess you would just say, hey pick a senior instead of Rhodes in the second round, boom save 800K! This is easy!