WGS, I'll give some insight on your brother's Tink since Shadic is probably gonna be too busy with work or pm stuff, and he mains Link anyways (yuck
).
Mind you I'm probably not even as good as your brother is and I'm not anywhere near close to mastering the character, but I do main him and I can give some points on how he can improve regardless.
First of all, I'd like to say even though your brother is new to the character, he's a pretty darn good example of how a real toonlink should be played. Great combos, edgeguarding and spacing all around! Keep it up!
But of course we can all improve; (some of the things I suggest I also need to work on as well! :D)
So here's some things that I would suggest he works on:
-Aerial Glide Tossing/ Bomb-Jumping
Man, I haven't gotten this down pat yet either. I can do it in training mode, but when it comes to an actual match I always forget about it! Anyways, either your brother doesn't know how to do it, or he's doing it incorrectly. You're supposed to airdodge AND throw the bomb almost simultaneously. What I do is I airdodge upwards, and while my control-stick is still in the "up" position, I press A and throw the bomb almost immediately after the airdodge imput and you should get a nice small boost upwards while throwing up your bomb, in which you can proceed to up-b into it. The timing is something that takes some practice though. It seemed like he was c-sticking the bomb upwards and then up-b'ing, which unfortunately doesn't seem to work
-Bombs Away!
I noticed that your brother doesn't make use of his bombs as often as he does the aarow. While the aarow and boomerang are amazing tools, the bomb is also great! When he has space and time to do so, he should always short-hop bomb-pull to remain mobile on the stage while having a bomb on-hand ready to go as they are the projectile you have the most control over and when successfully hit, gives you a window for a free aerial or another projectile. Think about peach with her turnips- when she gets the time and space to do it, she'll pull out a turnip, so the same kinda thing applies to tink, except he can bomb-pull more often and much easier since he can do it in midair.
I'm not saying don't use your other projectiles as much- just advising that he should make more use out of bombs as a tool. I find I almost always get a free up-b when I smash up-throw a bomb into an enemy falling above me
-Usmash
-is a really darn good move. It combos at low percents and kills at high percents. I noticed your brother goes for alot of u-tilts after d-throws but he should also consider that usmash is actually another very viable option out of d-throw (or even in general!) as it does a ton of damage and can even potentially Link into an up-b. Just make more use of it! It's probably his best smash attack, as you can use it in more situations than your other two smashes. For example, it's a good move to follow up a projectile. You can throw a bomb/rang/aarow (I usually go with the bomb) and get in a free running usmash that at a lower percent could Link into a bair/bomb/fair or up-b. It's a really effective move and I highly recommend making more use out of it!
-Hookshot
Now, I'm not sure about this one as I've yet to incorporate it into my playstyle myself, but zair seems like a pretty good spacing tool. It has very little lag on landing and has a crap ton of range. It's like a weaker nair with more range. I usually forget about it, but I could see it being a pretty useful tool for spacing an enemy, keeping them at bay while you spam stuff at them
And that's pretty much all I got. Overall, your brother is really quite good with tink and he should keep it up! More tink players means more potential for him to place in future tournaments, afterall! I hope I don't sound condescending as you/your brother reads this. I'm just another fellow tink main who wants to help out and improve the tink metagame overall, even though I'm just another sub-par player
oh yeah, and d-throw -> up-b *****. he probably knows this already though. :D