I feel like my potential Stakeholder/Co-Founders aren't pulling their weight or producing much verifiable output. Am I being too impatient or are my concerns legitimate?

Backstory:
I developed a prototype for a new digital product that has not been done before - a new evolution on a 1.1billion dollar industry. Think of it like using an Artist's song, but delivering it in a unique way.

I reached out to someone (Mr X) who had legal and relationship experience with 'Artists' and I reached out to someone (Mr Y) which Tech experience to help build the app.

I'm the product expert & idea guy.

Both X & Y, loved the idea and wanted to join as soon as they heard about it and experienced the prototype.

It's been 2 weeks in and I have:

1. Developed 2 more prototypes (to start creating a library)
2. Created a Financial Model to test assumptions
3. Set up a Project Plan
4. Contacted a Start-up Lawyer to help formalise everything
5. I sent a survey to 700 people and had 121 people respond to test the viability of the idea
6. Designed a Logo (although it won't be the final one we land on)

Mr X - has sent a list of 100 possible artists to start focusing on, he also sent a survey to 11,000 on his list and only had 40 replies.

Mr Y - has put his existing team into a chat to get them aware of possible upcoming work.

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I'm seeking advice because it's easier to pull out now, than it will be once things are formalised with Operating Agreements and Stakeholder agreements.

Advice?