I confirm this. I have a total of 168k ATK and DEF points, and have 2 LUs, Banuq being fully legendary-equipped. And my HD4 is still light-green with 1% of HP. Considering that HD4 requires 163k to be dark-green, this is an evidence of LU points being bugged.
Any news about this? It's a major issue and it has been existing since the introduction of Legendary units.
Attack strength (ATK): 74509 (+ 214) Defense strength (DEF): 81797 (+ 214) Total hit points (HP): 50002
MECH:
6762 ATK 7250 DEF 100/1250 HP
ATK+DEF total = 170,318. I've equipped the legendary axe on Baradeth but I'm ready to bet that the HD4 will still be light-green. You can also count in about 600 HP in this calculation, since 1% HP is still something. Meaning I'm almost 8k over the threshold, yet my HD4 is still light-green when I look at the list. I'm very confident that this is a bug. And a serious one, if you ask me. LUs take too much effort to summon...
i confirm what is said above, it is undeniable that the legendary units don't work, and even the items on them! i checked this by healing few hp at a time (100 or less) my army until i got a dark green on a heroic dungeon. then i removed a theseract helm and an improved rage potion (so it didn't affect HP) and i still had a dark green even thought my total points previously would give me a light green in that range. after this experiment i can confirm that the legendary units and their equipment affect at best the total health of the army but atk and def doesn't contribute in the total points for HD. this makes even the legendary smith completely useless; i suggest you to wait until they fix the bug before producing anything related to a legendary unit.