It is called building a case. To prove a conspiracy charge you have to prove there is an underlying crime involving two or more people acting in concert. What I would say that Fitz is doing is first approaching the GJ with the crux of the matter - perjury about the outing of Plame. Perjury is the threshold issue that needs to be proven before the rest of the charges can be presented otherwise you're putting the cart before the horse.
Here's the federal statute
http://www4.law.cornell.edu/uscode/html/uscode18/usc_sec_18_00001623----000-.html18 U.S.C. § 1623. False declarations before grand jury or court
Release date: 2005-08-03
(a) Whoever under oath (or in any declaration, certificate, verification, or statement under penalty of perjury as permitted under section 1746 of title 28, United States Code) in any proceeding before or ancillary to any court or grand jury of the United States
knowingly makes any false material declaration or makes or uses any other information, including any book, paper, document, record, recording, or other material, knowing the same to contain any false material declaration, shall be fined under this title or imprisoned not more than five years, or both.(b) This section is applicable whether the conduct occurred within or without the United States.
(c)
An indictment or information for violation of this section alleging that, in any proceedings before or ancillary to any court or grand jury of the United States, the defendant under oath has knowingly made two or more declarations, which are inconsistent to the degree that one of them is necessarily false, need not specify which declaration is false if—
(1) each declaration was material to the point in question, and
(2) each declaration was made within the period of the statute of limitations for the offense charged under this section.In any prosecution under this section, the falsity of a declaration set forth in the indictment or information shall be established sufficient for conviction by proof that the defendant while under oath made irreconcilably contradictory declarations material to the point in question in any proceeding before or ancillary to any court or grand jury. It shall be a defense to an indictment or information made pursuant to the first sentence of this subsection that the defendant at the time he made each declaration believed the declaration was true.
(d) Where, in the same continuous court or grand jury proceeding in which a declaration is made, the person making the declaration admits such declaration to be false, such admission shall bar prosecution under this section if, at the time the admission is made, the declaration has not substantially affected the proceeding, or it has not become manifest that such falsity has been or will be exposed.
(e) Proof beyond a reasonable doubt under this section is sufficient for conviction. It shall not be necessary that such proof be made by any particular number of witnesses or by documentary or other type of evidence.
So, if a perjury charge is submitted for two defendants and a true bill is issued by the GJ on these two charges then it opens the door for other defendants and charges.
This is an over simplified explanation but it does make sense what Fritz is doing in not overloading the GJ with every possible charge and every possible defendant at one time.