matching column variables from two awks!

i have a program that prints out a formatted df command
by sorting and grepping and using awk to print it out.

it basically executes df -h | grep whatever | sort -n +5 and then
awks
to a nice printout like:

disk size capacity
------------------
foo	20gb	70%
moo	40gb	25%
bar	20gb	70%

i'd like to add a new column "accounts" to this print out.

the no. of accounts is derived from a command:
awk {'print $5'} myFile |sort |uniq -c |sort -nr

which prints rows like:

450 	foo
300	moo
104	bar

i want to integrate this command into the formatted df program's
output.
i can't figure out how to appropriately append the "account count"
column from the myFile command, to the appropriate row of the
formatted df output,
e.g. where col 1 from the formatted df output matches col 2 of the
myFile command.

so it looks like this:


disk size capacity accounts
---------------------------
foo	20gb	70%	450
moo	40gb	25%	300
bar	20gb	70%	104


Thanks for any hints!
sg