The pic you posted is misleading: Q had answered the question if jfk jr is alive with a clear "no". Someone is posting it over and over again around here.
>how is jfk jr linked to 23?
Wouldn't know if at all – don't think so. 23 & 17 both play a role in Q's previous posts. In this pic the anon who made it just summed up the numbers in the posterIDs (circled).