Now you ask, what prevents me from opening additonal accounts at Vanguard with different account numbers and put $25K of Primecap and $25K of Capital Opportunity in each account, each year?
My answer is nothing.

Each Vanguard fund reserves the right to reject any purchase request—including exchanges from other Vanguard funds—without notice and regardless of size. For example, a purchase request could be rejected because the investor has a history of frequent trading or if Vanguard determines that such purchase may negatively affect a fund’s operation or performance.

Exactly. Vanguard only allows cancel order early in morning. Other times are not okay even if you call their agents.
I will talk with their Flagship service first to see if I can get into the Investor shares first. Afterward i can add up to $25k per year until reaching the Admiral requirement, $50K.

According to the various prospectuses, flagship customers can open new accounts. The prospectuses don't describe the procedure.
VPMCX:

Vanguard PRIMECAP Fund is closed to new accounts for investors not enrolled in Vanguard Flagship Services® or Vanguard Personal Advisor Services®. Clients of these services may open new Fund accounts, investing up to $25,000 per Fund account per year as described in this supplement ...

Several weeks ago, I asked Vanguard if Flagship customers can initiate a position in VPMAX.
Their representative stated that this was not allowed.
Either the Vanguard representative was wrong or the corresponding Supplement to the Prospectus (dated 2019) needs to be revised.

I should correct my earlier statement that ALAAX held some Oppenheimer funds in 2008. The symbol for ALAAX suggests it’s an old Aim fund that Invesco picked up prior to merging with Oppenheimer. In that case, it could not have included any Oppenheimer funds in 2008. Perhaps that highlights that care must be taken when comparing long term records, as funds can change substantially over a number of decades.

Vanguard PRIMECAP Fund is closed to new accounts for investors not enrolled in Vanguard Flagship Services® or Vanguard Personal Advisor Services®. Clients of these services may open new Fund accounts, investing up to $25,000 per Fund account per year as described in this supplement ...

Vanguard PRIMECAP Core Fund is closed to new accounts for investors not enrolled in Vanguard Flagship Services® or Vanguard Personal Advisor Services®. Clients of these services may open new Fund accounts, without purchase limitations

@msf said:
One cannot open a new account in a Vanguard PRIMECAP fund (Primecap, Primcap Core, Capital Opportunity) unless one is a flagship customer at Vanguard. As Vanguard closes other funds it usually (but not always) continues to make the funds available to flagship customers. Only flagship customers at Vanguard can add more than $25K/year to VPCCX.

Good numbers. As an aside, you’ve shown that ALAAX currently holds substantially more fixed income than PRSIX.
PRSIX = 41.21% fixed income
ALAAX = 49.83% fixed income
Difference = 8.62%
Truth be told, a higher % in fixed income (ALAAX) would have led to somewhat lower returns in the period since 2008 as interest rates (even on junk bonds) have been mostly low single-digit while equities have been in a prolonged bull market (IMHO a reason to disavow them on occasion ).

What is fixed income investing?
Fixed income is an investment approach focused on preservation of capital and income. It typically includes investments like government and corporate bonds, CDs and money market funds. Fixed income can offer a steady stream of income with less risk than stocks.