User blog comment:Real Godisme/Chapter 479/@comment-27281341-20160328162024

FDKM is different than Igneel's power. Think of FDKM as LFDM. Natsu at first used Laxus power with Laxus mp. Now Natsu can use it without Laxus mp. The difference between the two is that Natsu discovered a new mode alone, the FDKM and made it his own. But, against Zeref, instead of using his own power to run the mode, he used Igneel's power. Now, he used his own mp. It's not BS. The FDKM was never a one-time only power. Igneel's power was. Good chapter overall.