In SS, his spin might be better but Joubert did a perfect 4-3 (the only one in the top 6 skaters). So their SS should be at least even or Joubert's higher.
The SS part of the component marks has absolutely nothing to do with the individual elements marked in the TES scores. So comparing Chan's spins and Jouberts Quad is meaningless in this context. Below is the definition and criteria for SS from the ISU site and IMO Joubert shouldn't even be close to Chan in this category.
Skating Skills
Definition: Over all skating quality: edge control and flow over the ice surface demonstrated by a
command of the skating vocabulary (edges, steps, turns, etc), the clarity of technique, and the use of
effortless power to accelerate and vary speed.
Criteria:
Balance, rhythmic knee action, and precision of foot placement
Flow and effortless glide
Rhythm, strength, clean strokes, and an efficient use of lean create a steady run to the
blade and an ease of transfer of weight resulting in seemingly effortless power and
acceleration.
Cleanness and sureness of deep edges, steps, and turns
The skater should demonstrate clean and controlled curves, deep edges, and steps.
Varied use of power/energy, speed, and acceleration
Variety is the gradation – some of which may be subtle
Multi directional skating
Includes all direction of skating: forward and backward, clockwise and
counterclockwise including rotation in both directions.
Mastery of one foot skating
No over use of skating on two feet.
Pair Skating and Ice Dancing: Equal mastery of technique by both partners shown in unison.
Ice Dancing: Compulsory Dance – Ice Coverage