Digital quandary advice needed

Help with system setup and equipment
I would like your opinions and equipment experiences in figuring out my dilemma for the best use of my equipment and or recommendations of equipment upgrades. Any help is appreciated. The way I listen to music and watch movies / TV shows I rely more on the Oppo, and my computer than the Marantz features (maybe I am missing something)

My current equipment for this system:
Sunfire Theater Grand IV processor (not in system at this time), Marantz AV7005 processor, Sunfire Cinema Grand Standard (225 x 5) Energy V2.2i main with matching center and surrounds, (2) Sunfire True Subwoofer MK IV, Oppo 103 w/500gb HD FLAC files, HP laptop i5 chip, 8gigRAM, 500gb SSD x 2. Subscriptions to Spotify Premium, TIDAL Lossless stream, Netflix, Sony 70 inch 3D TV. Parasound DAC, GeekPulse DAC & LPS (GeekPulse DAC on order).

1. Is the Darby upgrade 103D or 105D worth it ?

2. Is the Qdeo processor in Oppo usable by running Direct TV HDMI to Oppo HDMI in 1 and HDMI 2 for computer video and would it better the Direct TV image ?

3. AV7005 is used mainly for volume control and switch between Direct TV and Oppo, Do I need the AV7005 or should I replace it with the Sunfire processor running all analog in from Oppo, Computer USB to DAC to analog in on Sunfire.

4. With my equipment limitations do you think I would notice the better DAC replacing the Oppo 103 with the Oppo 105D using analog outs ?

System is used about 80% Comercial TV, 12 % stream, 5% FLAC, 3% Blu-ray. I use the streaming services and FLAC much more with other equipment and headphones. I prefer my system volume at 80-90db for FLAC and HD music.

Thank you in advance for any advice you can make