Of course center line theory is in all martial arts among other things. I did not mean that FMA does not use center line, just that in some cases, the emphasis is not always the same as in WC.In WC, centerline is a primary (some would say dominating) theory used (correct me if I am wrong). In FMA it is used and is important but it isn't the overriding principle of FMA. Although WC does use weapons like butterfly swords and staff, weapon use is not to the extent of FMA. Through the weapon use other principles such as "defanging the snake" are also used. Now a WC person may use his butterfly swords to cut an opponents limbs but its not stessed as much as it is in FMA. (just using this as one example). One could also say that through the use of double butterfly swords elements of siniwali also appear in WC but not to the extent of FMA. WC also focuses more on close range. I'm not saying one art is better than the other, just trying to state differences.