It's easy, the analysis done showed playing your rookie QB, if drafted high in the first round, is not a detriment to his development, even playing on a bad team these QB's should play right away regardless of the team around them, the evidence to the contrary is non-existent.
The reality is you won't affect his development and you'll actually accelerate it.
Financially, it's also a no brainer. If you play the guy and he is good you now have the perfect modern NFL position to be in.
A franchise QB on a rookie deal after year 1 that not only frees up money to complement the roster but also entices free agents to want to play on your team.
Paying Love on 1 season is scary. If we had to pay Mac Jones after season 1, how would that have worked out?