Tariq Alardah

*ALERT *SPOILER I will start my question with major spoiler for people did not completed the main story yet. Noting that I am already in the begging of Chapter 6 now, and don't know if i should finish all the sides before continue in the main story line. Thanks in advance for your highly appreciated answers.

Will I miss anything else besides the money if I ignored the carcass and only stowed the skin? Are they have any use in crafting and perks?

Even the game show my weapon thrown on ground, i will find it later on my horse?

When I find a weapon on ground, for example killed person's gun, to take it i have to swap it with my current weapon, how to keep both?