one shadow at a time is no problem, even 2. the whole game mode is really fun, except the last 30seconds. it feels like they didnt thought that through when designing it. 20 shadows camping at the last ring and the only way to get in is just jump in as pathfinder or something like that? no chance to fight yourself a way in? thats not really fun or skill, thats just luck if the shadows see you or not.
a solution would be that after 10legends survive, shadows respawn takes longer, like 20 seconds timer, but for that legends have to stay in that ring of the dropship for 10 seconds, and its a bit bigger, so its not complete chaos in there. than you can fight your way in, and you dont get rushed by 20respawning shadows at the same time