Is there any significance to the 7's in REKO or strategy?

[Blitzkrieg]

Is there any significance to the REKO strategy if all the 7's have been played out or used up in a SD or DD BJ game within the first 30% of the cards? What about if only half of the 7's have been played in a DD game? How about if little to no 7's have been played in SD or DD?

How about it if more than half or all of the 7's and a good deal of 2's and 3's have been played out in a SD or DD game (within 35% from start) to where they compose a very high count for the players, could this make a situation where a high count could present a lot of volatility (high negative variance in a positive count) in knowing that there are more 4's, 5's, and 6's in the remaining deck or decks with high card values? Potentially more 8's and 9's and 10's... getting paired up with 4's, 5's, and 6's will create stiff hand totals during a high count.

Are the 7's what constitute a negative IRC value in REKO and KO?