combo can be broken by death or dodge, including death of summon/clone.

based on what you said, the starting attack hits 1 target, water trumpet hits 2 target. So if enemy have a dodge-capable ninja, it's possible that it's not hit at this step. However, nii, being 4 target, will probably attack it and miss, thus interrupting the combo.

You'd need to at least take a screenshot of the enemy team thou

There is no "main chase" on high combo, all of them have to hit for it to continue.

I know this from fox ambush, which have tons of high combo. In turn 1, my combo always gets interrupted as one of the target is the masked man, despite the other targets are hit. ALWAYS.

Also, high combo chase targets random enemy, so it's even possible for the previous "main chase" to not be hit at all by a later chase (i.e. yugito could have performed attack non Ninja A while water main combo onto B and C. And, if you had a tenten in there, tenten might hit A and D)

No, it doesn't.

But because it doesn't, it might hit a new target which is capable of dodging (which was not hit previously, which allowed the combo to continue earlier), and the dodge will break the combo

No, it have to hit ALL of them. Even one dodge means it gets stopped