If the board is showing:
T♥ T⋄ A♣ J♠ 6♥
One player has an A⋄ 7♥
The other player has an A♥ 5♣
do they split the pot, or does the 7 becomes the highest kicker.
If the board is showing:
T♥ T⋄ A♣ J♠ 6♥
One player has an A⋄ 7♥
The other player has an A♥ 5♣
do they split the pot, or does the 7 becomes the highest kicker.
This pot is split since the kickers never get a chance to be used.
Texas Hold'em is all about making the 5-best combination of cards, regardless of how many of your hole cards are used.
In this particular example, the players have this hand:
Player 1 hand: T♥ T⋄ A♣ A⋄ J♠
Player 2 hand: T♥ T⋄ A♣ A♥ J♠
As you see, their hand is identical; they both have 2-pair.
Their kickers are never used since there is already a higher rank in the board, the J. And since the J is the 5th card, the hand stops there and kickers are never used.
This is a well hidden advantage of ace-rags if the board gets paired.