OK, so I can confirm that no one has one a championship under one ID at all levels in the same world. Here's what I've put together, with a key to explain it:
> World
> Coaches with D1, D2, and D3 Championships
> Coach Names
> Coaches with D1 and D2 Championships
> Coach Names
> Coaches with D1 and D3 Championships
> Coach Names
> Coaches with D2, and D3 Championships
> Coach Names
All Worlds Combined
1 2 3
ARomano, AceCards, Rails, aberwager, acn24, blapo21, colorblind79, emy1013, fatchance, goosegoslin, jbohrman, jdno, jsreilly, kelby_03, kevthekidd, lostmyth2, majresorter, mniven, mpollon, mswilso2, mullycj, oldresorter, porkpower, robdoc3, zhawks
1 2
ARomano, AceCards, Nellie, Plumpy, Rails, aberwager, acn24, airjare, ajcrawford69, aporter, ben3149, bentlie29, blapo21, bow2dacowz, brocktune310, broncosboy, cbriese, colorblind79, combalt, cyric612, dan2980, dedhed1959, doogan, drichar138, dwoelflin07, emy1013, fatchance, flyer1950, girt25, goosegoslin, gopokes24, griswald, isustud07, jason5, jbohrman, jdno, jlovicz, johncannon, johnsensing, jsreilly, kelby_03, kevthekidd, kgoat, kydynasty, ledfoot, liamsar, lostmyth2, lwbraun, majresorter, manonde01, mhoffa1382, mlatsko1, mniven, moy23, mpollon, mswilso2, mullycj, namshub, nfet, ohyesyouwill, oldman_sons, oldresorter, opshutdown34, porkpower, rc1990, rds_lsu, reinsel, robdoc3, sportsguy001, sully712, tannermcc, umpikes, winmag, zhawks
1 3
ARomano, AceCards, Rails, aberwager, acn24, ajwalton, andrewfrance, blapo21, bluespruce, cmthieme, colorblind79, daveymac, djbrewer0808, emy1013, fatchance, gillispie1, goosegoslin, grapevine25, jbohrman, jdno, jerkstore33, johnner26, jsreilly, kelby_03, kevthekidd, kmasonbx, kyle_lee7, l_eustachy, lostmyth2, lrmiller99, majresorter, mbalding, mccabemi, meany27, mfkidd, mmt0315, mniven, mpollon, mswilso2, mullycj, oldave, oldresorter, pablo_ohio, porkpower, rarlinghaus, robdoc3, roguedog, supclean, swiners, tanzetti, taz21, tntsdad1, vamrbball, vegaskevin, zhawks
2 3
ARomano, AceCards, Rails, aberwager, acn24, acroth2, aejones, ahook715, alblack56, alliem605, armyof1, bballjunkie3, blakesdad, blapo21, bmill237, brad_23, bretodonnell, brianxavier, bunkerbuster, cammby, carlnault, chapelhillne, coach_billyg, colorblind79, cubs171717, dknox, drubrally, emy1013, fatchance, furry_nipps, fussyd, goosegoslin, jbasnight, jbohrman, jdno, joelhall32, jsreilly, kelby_03, kevthekidd, khook19, kkyutzy, kypride, lostmyth2, majresorter, mniven, mpollon, mswilso2, mullycj, nghtrngr04, norm24, oldresorter, paland, palewhiteboy, phalla, platoisek, porkpower, robdoc3, rockafe11a, ronm605, rusticity, starrider19, stunoell, testudo34, tianyi7886, toysboys, uk_bill, urdanick, whunt1, wpd6900, xulapaul, zhawks
Naismith
1 2 3
1 2
AceCards, Plumpy, combalt, johnsensing, nfet, porkpower
1 3
mccabemi, meany27, vegaskevin 2 3 bballjunkie3, mullycj
Wooden
1 2 3
1 2
airjare, broncosboy, jbohrman, kgoat 1 3 cmthieme
2 3
blakesdad, toysboys
Rupp
1 2 3
1 2
Nellie, aberwager, girt25, moy23, oldresorter
1 3
2 3
emy1013, tianyi7886
Smith
1 2 3
1 2
ajcrawford69, colorblind79, gopokes24, liamsar, mullycj
1 3
jsreilly, mniven, pablo_ohio
2 3
Iba
1 2 3
1 2
combalt, lostmyth2, lwbraun
1 3
oldresorter, supclean
2 3
brianxavier, furry_nipps, wpd6900
Allen
1 2 3
1 2
jason5, kelby_03, majresorter
1 3
2 3
acroth2, mpollon
Crum
1 2 3
1 2
acn24, rds_lsu
1 3
roguedog
2 3
jdno, urdanick
Tarkanian
1 2 3
1 2
aporter, blapo21, lostmyth2
1 3
gillispie1, johnner26, oldresorter, swiners
2 3
Rails
Knight
1 2 3
1 2
cyric612, fatchance, robdoc3
1 3
2 3
alliem605
Phelan
1 2 3
1 2
kydynasty, rc1990
1 3
zhawks 2 3 blapo21, cubs171717