Its for early push power. That’s why Orendi does it as well. If im Level 5 and the enemy team is level 2-3 they are going to get DEMOLISHED that early into the game placing your team at a massive advantage as they will get some damage on the sentry or even take it down. Think of it as a blitz play in football but with less Cons to it.
Not to mention it puts El Dragon out of the line of sight for the enemy as he is a big target.
Characters like El dragon and Orendi offers the team more benefits as they level up and they both have OHKO Ultimate’s.
Yes its preference but in competitive / tournament play a rushed Orendi and Dragon instantly puts the other team at a disadvantage causing the enemy team to slowly level up. And Orendi and Dragon Does better when the enemy team are all cramped together and this happens when the enemy team is Cramped under their sentry so I normally get Double and triple kills causing them to even level up slower.