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...it would go:
3/29 - Felix
3/31 - Paxton
4/1 - Leake
4/3 - Gonzalez
4/4 - Felix
4/5 - Paxton
4/7 - Leake
4/8 - Gonzalez
4/9 - Felix
4/10 - Paxton
4/11 - Leake (uh oh! - that's three days rest...which would mean we need the fifth starter the 11th)
If they go by the fifth-day rule and give pitchers lower in the pecking order some skips:
3/29 - Felix
3/31 - Paxton
4/1 - Leake
4/3 - Felix
4/4 - Gonzalez
4/5 - Paxton
4/7 - Leake
4/8 - Felix
4/9 - Gonzalez
4/10 - Paxton
4/11 - and you STILL need that fifth guy on the 11th
The 11th is the date.