Movement is a funny thing, players can look busy while achieving little.
Jelavic was a master at doing little but being as effective and efficient as any player I have seen play for us, he would generally watch a game of football happen and impact it when needed rather than chasing much down or using much energy.
Morelos at his best, which he hasn't been this season, can make things happen with his energy, he will force people to make mistakes by getting in their shit.
Sakala has the assets and pace to hurt sides, on Sunday it felt like a lot of it was wasted energy though. It was a bit early Kenny Miller for me, what are you chasing and why, has a habit of making runs that just don't look right