It's only your opinion without any arguments. I knows many things about real submarine tactics but this is DW. Most of Russian players prefer ASM's instead torpedoes - you should tell them they knows nothing about real warfare
I don't blame you for this scenario. Every scenario designer made at first not well designed missions. You should improve your knowledge instead "fighting" on forum with me. This mission could be improved by making correct randomization and decreasing ranges. So huge ranges are not funny to play - it makes your mission irritating.
Here is how to make random position for formation:
https://youtu.be/fMUaztFyQrk
About ocean fauna - DW have limited possibilities so you should understand single whale or any visible on BB sonar fauna is like group. Its because Whales when not singing are NOT visible so strongly on broadband sonar. Puting dozens of fishes don't make scenarios more realistic - it's exactly the opposite.
In real torpedo wil not aquire on tuna fish school - even if - torpedo just go through. The same with whales. Torpedo cannot aquire whale! But even if it would be possibile torpedo make big hole in whale body and go further.
If DW would have seagulls, will you add thousand of this birds along coastline?
All civilian and ocean fauna objects takes small amount of processor computing - so its not very smart to place these object in high number in range where player haven't possibilities to detect it.
For submarine players ocean fauna haven't really matter - ist nice to hear something from nature in water - its all. Searching is most effective via Narrowband sonar - and NB cannot see "bio" objects.