uhm let me laugh because of your thread. Let me tell you this, when EXO-M debuted for 1 or 2 weeks, they opened SJ concert in my country, but what was the reaction? Neutral, even negative. All people said they wanna see SJ, they paid for SJ, they didn't need extra. So can you imagine if a senior opening EXO concert? It'll be the same, even worse, cause both group are popular enough to hold their own concert.