The chapter had a really shoddy translation,as expected of Mangpaanda. At least it was readable. Hopefully a better one shows up later.
Makarov overstayed his welcome in the sirious island arc. If Mashima wanted,he could have Acnologia kill him,have gildarts be the fifth and then have him make Laxus the sixth.
Only reason why this probably didn't happen was because Makarov is among the few people who know about fairy heart. Some chapters Makarov explains everything,I imagine that he is gonna kick the bucket for real. His death flags are still waving like mad.
A second reason is probably because he was planning to have Acnologia kill Igneel,so he probably didn't want for Acnologia to have such a big kill count.