Rookie pool is the max you are allowed to spend on your rookies in that year, and although your spending that much on rookies it does not mean all of it are counted against the cap because you ahve to remember the rule of 51. As a good rule rounds 3 through 7 rookies dont make enough to be in the top 51 salaries thus they wont count against the cap. For us and where we picked are 31st pick will be estimated at 900k against the cap and the 2nd rounder will count about 600k. So only 1.5 of are current cap space needs to be budgeted for rookies.
Which leads to a side note. Here is what we can expect to be paying Wells and Cody Brown based on last years picks at the same spots, I just added 5% more and we should be pretty close:
Wells - 5 years - 11.75 total(3 mil of which is in incentives) - 2.66 mil signing bonus
Brown - 4 years - 2.75 total - 935k signing bonus