The Laves phase superconductor CeRu2 (6 K) has long served as a platform for exploring the interplay between superconductivity and magnetism. Early studies of this compound were driven by anomalous magnetization features, sparking debate over whether they originated from a disorder-driven peak effect or a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. Concurrently, heat capacity measurements revealed a heavy-fermion character and an anisotropic-wave superconducting gap. Recently, ARPES measurements have renewed interest in CeRu2 by uncovering a dual electronic architecture: flat bands originating from the Ru 4d pyrochlore sublattice coexisting with localized Ce 4f electrons hybridized with the Fermi sea. This raises a fundamental question regarding the role of these flat bands in shaping the superconducting state. In this work, we utilize high-resolution thermal and electrical transport measurements to probe the quasiparticle dynamics in CeRu2. By contrasting quasiparticle behavior in the normal state with that in the superconducting mixed state, we probe their underlying nature and the influence of flat-band physics on the superconducting pairing.