I like this kind of approach as well.
This is not a debate as to whether JWs ever had God's Spirit. This is to get a (doubtful) JW to start thinking.
I like to ask if all the "weird" chances might be because and "apostate" has infiltrated the higher echelons of the JW Org. Would Jah allow that? He did in the 1980's, didn't he? Remember Ray Franz? (NOT that Ray was an apostate. Just that that is what WTS claims.)
Lots of JWs are skeptical about all the "New Light". You know what happens once a person begins to question thing...... One domino......two dominoes............BAM