As far as I have found, the best possible team would have been:
CONTADOR VELASCO Alberto
ARU Fabio
SANCHEZ GONZALEZ Samuel
NAVARRO GARCIA Daniel
STUYVEN Jasper
HERNANDEZ BLAZQUEZ Jesus
NIEMIEC Przemyslaw
ANACONA GOMEZ Winner Andrew
DE MARCHI Alessandro
Cost 3460, score 2389. Another combination might beat it.
Interesting that this team omits Froome: the highest non-Froome team was Trudgin (20th)
Highest placed who suffered with Quintana's withdrawal: 18Valve (14th)
Highest with Quintana but not Froome: Panda Claws (42nd)
Combined Competition
Those who have entered all 4 of my games
Classics+Giro+Tour+Vuelta=Total
1 Hugo87 1563 + 2536 + 1114 + 2057 = 7270
2 Leadbelly 1547 + 2171 + 1449 + 1690 = 6857
3 NairoQ 1753 + 2472 + 1496 + 948 = 6669
4 Kazistuta 1606 + 1615 + 2237 + 1022 = 6480
5 GeraintTooFast 1201 + 1972 + 1344 + 1639 = 6156
6 Oliveira 2001 + 1798 + 456 + 1835 = 6090
7 Josedin 2197 + 1785 + 994 + 1011 = 5987
8 Dazed_and_Confused 1460 + 1145 + 1967 + 1349 = 5921
9 Afrank 1474 + 1512 + 1850 + 946 = 5782
10 Search 1272 + 1963 + 1441 + 1073 = 5749
11 asdfgh101 2030 + 1530 + 857 + 961 = 5378
12 JustSomeGuy 2060 + 1613 + 762 + 802 = 5237
13 Comodoro 765 + 1623 + 2263 + 549 = 5200
14 Armchair_Cyclist 1668 + 1740 + 582 + 1094 = 5084
15 Del1962 1461 + 1741 + 383 + 1467 = 5052
16 18Valve 1667 + 934 + 754 + 1415 = 4770
17 Mutschi 1451 + 1663 + 383 + 1168 = 4665
18 MC_Mountain 1387 + 1204 + 853 + 798 = 4242
19 LightBing 1257 + 1046 + 356 + 1221 = 3880
20 Trudgin 318 + 251 + 880 + 1236 = 2685
If you'd like to examine the data further, the final table is
here at Dropbox