First match, I really can't say much on about character as I just make due when fighting dk and can't give specific character advice. The dk seemed to be very agressive while you seemed abit afraid and timid in this match. Great reverse u-air edgeguard on first stock.The down-b at 1.48 seconds lol...but the dk knows how to combo you pretty good and sheildgrabs you often.
as with the other edgeguarding attempt with thereverse u-air after your first one, sometimes its best to leap out and interupt them instead of waiting for them like that.
At 2.17 and so, you can wiggle out of that tumbling instead of just falling like that, its risky and un-needed. At the end, you tried too hard to hit with the d-air so it was predictable.
IC match: You need to work on your edgeguarding abit, especially with his over-b. Start mixing it up abit, you left ganon's ground game abit dry so if they focused on sheildgrabbing, it wouldn't have been fun but you did well on spliting them up for the most part.
Sheik match: He owned you with that chain lol. You let many attempts to grab, such as after sheilding his dash attack, go by without trying. and as for you saying chaingrabbing isn't that useful, you can't be more wrong..its your really only way of adding on damage easy to her. Its what makes her chaingrab on you slightly less gay (but still amazingly flaming) and leads to good ending blows. Bailey was somewhat nice about chaingrabbing you, he didn't make it flaming. Sweetspotting would help alittle in this match as you messed up quite a few times. Once again..the ownage with the chain that you can do nothing against lol...plain cruel.
Overall I seem a big problem that appears in them all: Your spacing, it needs abit of work, it seems to be a problem that keeps popping up. I seen a few times you should have sweetspotted but didn't as well.