First and foremost, you'll be responsible for autofills being completed efficiently and truck backstock being done on time. Since you probably won't be around for a majority of the CAFs and probably won't see your evening team like ever, you'll need to be able to interpret pull times and individual accuracies to see who isn't pulling their weight.
Like others have said, you'll very likely be over another team. Since our BRTL is a senior, he often oversees trucks when the flow TL or ETL-Log can't make it. But 9 times out of 10, that team will be instocks.
Lets say 80% of the position is responsible for keeping the EAM BR team focused and the other 20% is indirectly holding the other half of your team accountable. If your store has a well working backroom, the transition between TLs should be pretty simple.