Not ezackly
blackjack having the less gain... only if we are playing like total morons or the rules say "hit stiffs".
What you can do with the chart is subtract the different edges at different counts. For example, the gain from standing, at RC = +3 is 6% and at RC = 0, it's 5.1%. So the gain for 3 RCs = 0.9%. The gain for 3 RCs for naturals is only 0.6%.
That said, it's a little difficult to get a firm handle on the gains from the chart, because the baseline (the EV for mimic the dealer strategy) is itself a composite. Also, T-H Basic is an unbalanced running count system that starts at -4 for single deck, instead of zero, which most of us are used to.
What I did, was calculate the probability of getting an untied natural with hi-lo TC = 10 (using the average deck idea, invented by Griffin), then calculated it for TC = 0, subtracted and multiplied by 0.5, then divided by 10 to get average gain from naturals per TC = 0.12%. This is less than half the overall gain we get per TC, documented by Wong and many others, of 0.5% per TC.
ETF