Current upgrade time is only the upgrade time for those currently upgrading. It has no bearing for a new hire. PSA and Compass hired a huge % of their pilot group over the last 1-2 years to cover massive attrition and growth. A new hire coming there today will not experience the same "quick upgrade" unless the companies go through another phase of massive attrition and growth, which isn't likely to happen in this market.
On top of that, the majority of those getting the "quick upgrade" had prior 121 time to upgrade above other deferrals, who as a result saw their upgrade time extend.
RAH can't staff their airline appropriately and has been shrinking and showing no signs of going the other way. Going there will mean your upgrade time will be longer than if you went to a regional that isn't shrinking and has similar captain attrition. It will be even longer than at one with higher captain attrition (Endeavor via SSP agreement with Delta).