Not sure what you are getting at.
Locks must bind onto each other and the FR. Flankers bind only onto the locks. This has not changed between 2017 and 2018 even if the wording has (slightly).
2017
(f) Binding by all other players. All players in a scrum , other than front-row players , must bind
on a lock’s body with at least one arm prior to the scrum engagement. The locks must bind
with the props in front of them. No other player other than a prop may hold an opponent.
Sanction: Penalty kick
2018
c. The locks bind with the props immediately in front of them and with each other.
d. All other players in the scrum bind on a lock’s body with at least one arm.