You're welcome. Please let us know if you discover anything worthwhile. I will take some time to properly backtest it myself.
In my opinion, it can both be helpful and deceiving/confusing. Not every signal/divergence is as clear as on the chart I posted and not every divergence is useful. I don't think NQ always leads either.
I think the correct approach would be to rely on ES if that's what you're trading - and receive additional confirmation/confidence if NQ agrees.
Jack Hershey and his disciples claims that YM leads the ES.