I think it's okay to make the "x sharing" link that small for two reasons :

- Some people doesn't really like the idea to share their taxi with unknow folks
- This is first of all an information, not every users care about who is sharing their taxi and nor would they tap the link

**But if your goal is to increase the social part of the app** you could make it visually bigger or try to display the user's profile picture directly on the first screen. 

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That been said, I don't think your second screen is too cluttered. Actually it's well structured with all the informations. You did a great job !

**EDIT** : On the other side, the "Request Seat" should probably be bigger since it is the main action to perform (you could design it as a large button). 

*P.S.: I'm wondering if it is really important to show how much the others are paying for the taxi ?*