The arXiv preprint (not yet peer-reviewed) by Boogaard et al. reports JWST NIRCam and ALMA data revealing a mature stellar bar within GN20, a baryon-dominated disk at z=4.055 where gas comprises 75% of the baryonic mass. This single-object case study, based on multi-wavelength imaging and kinematic modeling of one extreme star-forming galaxy, directly contradicts the long-held view that bars require gas-poor, secularly evolving disks. Standard LambdaCDM simulations predict delayed bar formation until z<2; GN20 shows instead that bars can emerge rapidly even in gas-rich systems, potentially driving early bulge growth and quenching. Prior JWST reports of high-z bars (e.g., in Costantin et al. 2023) emphasized baryon dominance but assumed gas depletion; this work highlights the overlooked role of gas in enabling dynamical instabilities. Limitations include the small sample size of one galaxy, reliance on indirect dynamical modeling without full kinematic resolution, and absence of long-term simulation validation. Related studies such as the 2024 Nature Astronomy paper on JWST spiral galaxies at z3 and Agertz et al.'s gas-rich simulation suite reinforce that early assembly may be more rapid than models allow, implying revised prescriptions for feedback and angular momentum transport.