Very different players.
Tupou has decent size and power, but not much speed and is not a great leaper under the high ball despite his height.
Kris is just on six foot tall, so not overly tall for a modern day winger, but he is a lot quicker than Tupou and is generally a good leaper and good under the high ball.
Not forgetting Kris has played most of his NRL games as a centre, so would keep the pressure on Averillo and be a valuable NRL experienced back up if either centres are injured.
Not forgetting Averillo has always been a bit inconsistent throughout his career, so if he is our starting right centre we need serious competition for his position to keep him honest and If someone like Kris was playing too well to leave out of the centres, Averillo could play on the wing.
As much as Herbert rips in and does his best, he is far too slow to be a good to high quality NRL centre against top class opposition. He is ok if he is our 4th or 5th choice centre, but we will again struggle scoring points if we have to rely on him as one of our centres too often in 2027.
He also gets cought out defensively for speed against top quality opposing centres.
Herbert always plays tough and could be an option to play a bit of back row next season.