If the issue is that a Czar and Atlantis can be stealthed,
then I would argue the case should be as follows:
If Stealthed aircraft are the issue; then remove Stealth from Cybran T3 aircraft.
If Stealthed subs are the issue; then remove Stealth from Cybran T2 subs.
If Stealthed T4 units are the issue; then remove Stealth from the Monkeylord and Soulripper.
As stated before, there are other units that have the same abilities and can be found far earlier in the tech tree.
This is also does not include the other (easier) methods of obtaining the same exact scenario given the same units as stated in an earlier post.
~ Stryker