There appear to be a couple things that delay WI recognition (not reciprocity, that is two way, this is only a one way list...WI will recognize these states...it says nothing about the state that will recognize WI)
First, all of the states were sent a request for their current law, and if they could reach an agreement with WI. If the state did not respond yet, it will not be on the list.
Second, it has nothing to do with "training". WA requires no training for a CPL, but WA is on the list.
I THINK the problem could also be the secondary local criminal/mental health check. WI (WA also) does not think the NCIS check is enough. They also require a local criminal/mental health check to make sure something has not fallen through the cracks.