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I agree, Porsche may have the full 6MJ capacity on board, but higher capacity was chosen because of battery power rating. Even if using highest power density batteries possible it apparently wasn't good enough for 24h of molesting at 180 kW. Even if they have capacity overkill it's not necessary heavier than Toyota's supercap.
And also one thing to note is that Porsche is using ERS-H, this gives energy under full acceleration, they are probably not storing much of that energy but rather using it directly on the electric motor. Kinetic energy on the other hand must be stored and they have "only" >180 kW el. motor. This is a lot less than Toyota charge/discharge capability of 353 kW.
Looking at those two diferent numbers one could conclude that Porsche recuperates almost half of MJ energy from ERS-H, or Toyota has oversized el. motors (I doubt that).
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