Question about raids

Can you bring duplicate Champs into the same bg raid? As in say an alliance mate in my bg brings nick fury and chooses assault. Then since we need 3 of each roles played in each bg,can I also bring in my nick fury or do I need to bring someone else?
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Also can we use unlimited items without any penalty if we suck?
Raid is terrible for casual alliances as I have no Tacticians in my BG and I got told off for asking people to join… That’s my fault for trying.
Silk is really good for maestro and her damage is insane. Did a 60 second 10% yesterday. Therfore she is able to overcome the stun immune issue as damage is so high she clears the fight before it’s a problem. I’m able to hit damage cap with 1 charge on fight 2 (3 people brought tacticians in her bg so I’m not getting any help ramping 😭)