My guess as to why NAVB did file as an interpleader and deposit funds--recall from proxy probably no payment by Navb until 2021 (note looks like $1.4mm became $1.998mm-maybe interest added?)
Proxy
"...in exchange for the Acquired Assets,
Cardinal Health 414 agreed to: (i) make a cash payment
to us at closing of $80,000,000 (reduced by an aggregate of
approximately $65.5 million of indebtedness to be repaid to Capital
Royalty Partners II, L.P. (“CRG”) and Platinum-Montaur Life Sciences
LLC and its affiliates (“Platinum”)
on behalf of the Company (less approximately $1.4 million if the
transfer of debt to Dr. Goldberg occurs, as discussed under
“Interests of Our Directors and Executive Officers in the Asset
Sale” beginning on page 27), ....The Company has been advised that a portion of its outstanding
debt to Platinum, amounting to
approximately $1.4 million, which accrues interest at
an annual rate of 14.125%,
compounded monthly, as evidenced by a third amended and restated
promissory note, is currently
intended to be transferred to Dr. Goldberg upon consummation
of the Asset Sale. That part of
the Platinum debt not transferred to Dr. Goldberg will
be paid-off by us using
proceeds of the Asset Sale as the Asset Purchase Agreement requires
that, at closing, all
indebtedness of the Company be paid in full out of the initial
closing cash payment, which
includes debts payable to CRG, Platinum and, if the foregoing
debt transfer occurs, Dr.
Goldberg. The Company discussed obtaining a waiver of such
requirement with respect to any
Platinum debt transferred to Dr. Goldberg. Cardinal Health
414 has orally agreed to waive
such requirement provided there is no security interest
in the assets being transferred
to Cardinal Health 414. Dr. Goldberg has agreed to not
require repayment by the
Company of any debt transferred to him until the original maturity
date of September 30, 2021, and
has agreed to release any financial covenants and securitization
requirements. The Company and
Dr. Goldberg intend to finalize the negotiation of the
definitive terms of such
remaining indebtedness.