I am actually getting a more potent grasp of how to use double legend and shard generator. While I agree a good general rule of thumb is to wait until level 5 to start working on your legends I do think there is a few exceptions based off of how you play. Primarily either notable power spike levels or extremely important utility levels.
As orendi I focus on levels until I am almost 4(often times I only build one cycle of shock turrets give or take on overgrowth) because at 4 I can get preamble of pain to proc my bolas target finder which is the equivalent of a skill damage boost as your level 6 option for orendi.
For whiskey I like to focus levels hard until I can get my scope or perhaps my triple grenade at 4. After that I try to build my galahadric gungrease and vow of zealous fury. The scope for whiskey reaaaaaly helps him. I will note that in the interim of leveling into 5 and 6 I try to keep the shock turret at 3 so I can get experience from the minions
Phoebe I usually like to wait until I hit 5 as I struggle to feel like I can properly contribute to fights until then but I am still relatively fresh with her(picked her up for a second time after about a 2 month break)
For ambra I use a purple heal item that I try to get on ASAP and will prioritize building stuff usually but it being a purple it’s not hard to get it on and hit 3 since ambra is so good at tagging minions and killing them. Then it’s level focusing until just before 6 or at 6 so I can work on building her legendary for infinite fireballs.
Those are just a few examples. I couple other tricks in incursion that affect your economy: I don’t build the first level of shock right out of the gate. It’s very unlikely that even in coordinated play that they could max it out. Kill the turret immediately and try to free for all people back and hold mid. If at the first minute or minute and a half you find your being pushed back into your first sentry, invest in a fat bot. It’s pretty tanky and at this point in the game it will be the most dificult to kill than in any other stage of the game. This could give you the breathing room to take mid back enough to get the first round of large crystal spawns to really help solidify your control over mid and give you experience boosts from buildables



