Libra leading bitcoin is close to impossible because of some reasons:

Russia government says they won't legalize Libra coin
( https://cointelegraph.com/news/russia-will-not-legalize-facebooks-cryptocurrency-official-says)

Chair of House Financial Services Committee Requests Halt on Facebook’s Crypto Project
( https://cointelegraph.com/news/chair-of-house-financial-services-committee-requests-halt-on-facebooks-crypto-project)

French Minister of Economy to Ask for Guarantees From Facebook In Regards to Its Forthcoming Coin
( https://cointelegraph.com/news/french-minister-of-economy-to-ask-for-guarantees-from-facebook-in-regards-to-its-forthcoming-coin)

Senate Banking Committee Sets Hearing on Facebook’s Crypto for July 16
( https://cointelegraph.com/news/senate-banking-committee-sets-hearing-on-facebooks-crypto-for-july-16).

If you are able to go true that you will see that Libra surpassing bitcoin might not be possible.