The simplest solution is to try and use pattern recognition to see if he likes crossing up or not, and identify when he usually uses it. Once you identify their pattern, block appropriately. It’s a little difficult, especially if you can get panicked and don’t calm down to watch the pattern. Some player will crossup with the move and force you to block the wrong direction a lot, but some will train you to block one pattern, only to feint and fake you out. Each Shadow Jago player is different in how they use his tech.
However, individual character punishes for the characters mentioned.
I was just testing this before you replied. Sabrewulf can use eclipse to knock him out of dive kick, but you have to get a specific timing. Usually the hitbox is big enough to nail him either on crossup or non-crossup, but the timing needs to be a little later, like after Shadow Jago is in the air, which is usually on par with reaction time. Doing it sooner will cause the active frames of the attack to miss. Shadow Eclipse is unbeatable no matter the timing, but the sooner you do it, the less hits you’ll get out of shadow eclipse. If you do it too soon, you may only get 3/5 hits to connect instead of all five, but for the invincibility, it may be worth it to change the momentum.
Couldn’t really find anything reliable with Riptor.
With Glacius, you have the ultimate dodge. LIQUIDIZE! On reaction, you can liquidize and divekick will whiff. IMO, puddle punch is not ideal as it requires a guess to get the input correctly, otherwise on a crossup, like @STORM179 said your input may trigger cold shouder. Liquidize takes the guesswork out of the matter, has fast startup and good recovery, and against a whiffed divekick, puts you in great position. The window is fairly open and leniant, but it can get confusing because Shadow Jago may change sides with Glacius, and in puddle form, you may not realize it until after you come back up. Since you can control and travel in a direction with liquidize, you may be able to flip the game on your opponent with a little skill, which is only enhanced in instinct mode.
From a distance, as in there’s no chance for a crossup, all of them have an air move that will flyswatter Shadow Jago in the air. At crossup range though, air to air isn’t advised.
That’s the best I can give.