Skip the preclear, just replace the drive, build parity, do a parity check, do a long smart test on the drive.
Preclear is not productive for your situation, you want to get valid parity back in place ASAP. If you had a new drive in anticipation of replacing a drive that was still functioning, then preclear might be of some value, but only as a stress test to weed out infant mortality. You will get that same level of testing by rebuilding the drive and checking parity, and the bonus is you will be protected that much sooner. If the new drive fails during the process, you aren't in any worse shape, just back to needing another drive.
If you were getting a new drive to ADD to a NEW data slot, not replacing a drive, then preclear could save some time as well as give you a confidence check in the drive before trusting it in the array. This does not apply to your situation.